diff --git a/public/js/views/ticketDetail.js b/public/js/views/ticketDetail.js
index 58b4d41..c72a5d4 100644
--- a/public/js/views/ticketDetail.js
+++ b/public/js/views/ticketDetail.js
@@ -4201,36 +4201,53 @@ const TicketDetailView = {
       customerSearchInput.addEventListener('input', () => {
         clearTimeout(customerDebounce);
         const q = customerSearchInput.value.trim();
-        if (customerUserIdInput) customerUserIdInput.value = '';
-        if (customerIdInput) customerIdInput.value = '';
+        const origCustFirst = (this.originalValues['customer_first'] || '').trim();
+        const origCustLast = (this.originalValues['customer_last'] || '').trim();
+        const origCustName = origCustFirst ? `${origCustFirst} ${origCustLast}`.trim() : (this.originalValues['customer_user_id'] || '').trim();
+
+        if (q !== origCustName) {
+          if (customerUserIdInput) customerUserIdInput.value = '';
+          if (customerIdInput) customerIdInput.value = '';
+        } else {
+          if (customerUserIdInput) customerUserIdInput.value = this.originalValues['customer_user_id'] || '';
+          if (customerIdInput) customerIdInput.value = this.originalValues['customer_id'] || '';
+        }
         checkChanges();
 
         customerDebounce = setTimeout(async () => {
           try {
-            const customers = await App.api(`/api/customers/search?q=${encodeURIComponent(q)}`);
-            if (!customers || customers.length === 0) {
+            const users = await App.api(`/api/customer-users/search?q=${encodeURIComponent(q)}`);
+            if (!users || users.length === 0) {
               customerSuggestionsDiv.innerHTML = '<div class="autocomplete-suggestion-item" style="color:var(--text-muted); cursor:default; padding: 6px 12px; font-size:0.78rem;">Nessun cliente trovato</div>';
               customerSuggestionsDiv.style.display = 'block';
               return;
             }
 
-            customerSuggestionsDiv.innerHTML = customers.map(c => `
-              <div class="autocomplete-suggestion-item" data-user-id="${App.escapeHtml(c.customer_user_id)}" data-customer-id="${App.escapeHtml(c.customer_id || c.customer_user_id)}" data-name="${App.escapeHtml(c.first_name ? `${c.first_name} ${c.last_name}` : c.customer_user_id)}" style="padding: 6px 12px; font-size: 0.78rem; cursor: pointer;">
-                <strong>${App.escapeHtml(c.first_name ? `${c.first_name} ${c.last_name}` : c.customer_user_id)}</strong>
-                ${c.email ? `<span style="color:var(--text-muted); margin-left:6px;">(${App.escapeHtml(c.email)})</span>` : ''}
-              </div>
-            `).join('');
+            customerSuggestionsDiv.innerHTML = users.map(u => {
+              const fullName = (u.first_name || u.last_name) ? `${u.first_name || ''} ${u.last_name || ''}`.trim() : (u.login || '');
+              return `
+                <div class="autocomplete-suggestion-item" data-login="${App.escapeHtml(u.login || '')}" data-customer-id="${App.escapeHtml(u.customer_id || '')}" data-name="${App.escapeHtml(fullName)}" style="padding: 6px 12px; font-size: 0.78rem; cursor: pointer;">
+                  <strong>${App.escapeHtml(fullName)}</strong>
+                  <span style="color:var(--text-muted); margin-left:6px; font-size:0.75rem;">(Login: ${App.escapeHtml(u.login || '')}${u.customer_id ? ` | ${App.escapeHtml(u.customer_id)}` : ''})</span>
+                  ${u.email ? `<div style="color:var(--text-secondary); font-size:0.73rem;">${App.escapeHtml(u.email)}</div>` : ''}
+                </div>
+              `;
+            }).join('');
             customerSuggestionsDiv.style.display = 'block';
 
+            const selectCustomerItem = (item) => {
+              customerSearchInput.value = item.dataset.name;
+              if (customerUserIdInput) customerUserIdInput.value = item.dataset.login;
+              if (customerIdInput) customerIdInput.value = item.dataset.customerId;
+              customerSuggestionsDiv.style.display = 'none';
+              checkChanges();
+            };
+
             customerSuggestionsDiv.querySelectorAll('.autocomplete-suggestion-item').forEach(item => {
-              if (item.dataset.userId) {
+              if (item.dataset.login) {
                 item.addEventListener('mousedown', (e) => {
                   e.preventDefault();
-                  customerSearchInput.value = item.dataset.name;
-                  if (customerUserIdInput) customerUserIdInput.value = item.dataset.userId;
-                  if (customerIdInput) customerIdInput.value = item.dataset.customerId;
-                  customerSuggestionsDiv.style.display = 'none';
-                  checkChanges();
+                  selectCustomerItem(item);
                 });
               }
             });
@@ -4240,6 +4257,18 @@ const TicketDetailView = {
         }, 150);
       });
 
+      if (App.setupAutocompleteKeyboardNavigation) {
+        App.setupAutocompleteKeyboardNavigation(customerSearchInput, customerSuggestionsDiv, (item) => {
+          if (item && item.dataset.login) {
+            customerSearchInput.value = item.dataset.name;
+            if (customerUserIdInput) customerUserIdInput.value = item.dataset.login;
+            if (customerIdInput) customerIdInput.value = item.dataset.customerId;
+            customerSuggestionsDiv.style.display = 'none';
+            checkChanges();
+          }
+        });
+      }
+
       customerSearchInput.addEventListener('focus', () => {
         customerSearchInput.dispatchEvent(new Event('input'));
       });
@@ -4270,9 +4299,18 @@ const TicketDetailView = {
         }
 
         const customerSearch = customerSearchInput ? customerSearchInput.value.trim() : '';
-        if (customerSearch && customerUserIdInput && !customerUserIdInput.value) {
-          customerUserIdInput.value = customerSearch;
-          if (customerIdInput) customerIdInput.value = customerSearch;
+        const origCustFirst = (this.originalValues['customer_first'] || '').trim();
+        const origCustLast = (this.originalValues['customer_last'] || '').trim();
+        const origCustName = origCustFirst ? `${origCustFirst} ${origCustLast}`.trim() : (this.originalValues['customer_user_id'] || '').trim();
+
+        if (customerSearchInput) {
+          if (!customerSearch) {
+            if (customerUserIdInput) customerUserIdInput.value = '';
+            if (customerIdInput) customerIdInput.value = '';
+          } else if (customerSearch === origCustName) {
+            if (customerUserIdInput) customerUserIdInput.value = this.originalValues['customer_user_id'] || '';
+            if (customerIdInput) customerIdInput.value = this.originalValues['customer_id'] || '';
+          }
         }
 
         // Check metadata updates
diff --git a/routes/lookups.js b/routes/lookups.js
index f79b01c..74acb04 100644
--- a/routes/lookups.js
+++ b/routes/lookups.js
@@ -296,6 +296,12 @@ router.get('/customer-companies/search', async (req, res) => {
   }
 });
 
+// Alias /api/customers/search -> /api/customer-users/search for backwards compatibility
+router.get('/customers/search', (req, res, next) => {
+  req.url = '/customer-users/search' + (req.url.includes('?') ? req.url.slice(req.url.indexOf('?')) : '');
+  router.handle(req, res, next);
+});
+
 // GET /api/customer-users/search — Search customer users (supports LDAP via REST, fallbacks to DB)
 router.get('/customer-users/search', async (req, res) => {
   const { q = '', customer_company_id } = req.query;
diff --git a/routes/tickets.js b/routes/tickets.js
index b9b0c71..da7304d 100644
--- a/routes/tickets.js
+++ b/routes/tickets.js
@@ -387,7 +387,11 @@ router.get('/:id', async (req, res, next) => {
         // 1. Try to read from local SQLite cache in internal.db
         let cachedUser = null;
         try {
-          cachedUser = db.prepare('SELECT email, first_name, last_name, phone FROM customer_user_cache WHERE login = ?').get(ticket.customer_user_id);
+          cachedUser = db.prepare(`
+            SELECT login, email, first_name, last_name, phone
+            FROM customer_user_cache
+            WHERE login = ? OR (first_name || ' ' || last_name) = ? COLLATE NOCASE
+          `).get(ticket.customer_user_id, ticket.customer_user_id);
         } catch (dbErr) {
           console.warn('[LDAP Cache Detail] SQLite cache read failed:', dbErr.message);
         }
@@ -398,37 +402,50 @@ router.get('/:id', async (req, res, next) => {
           ticket.customer_email = cachedUser.email || '';
           ticket.customer_phone = cachedUser.phone || '';
         } else {
-          // 2. Fallback to live API fetch
-          const getResult = await otrsRequest('POST', '/CustomerUserGet', { UserLogin: ticket.customer_user_id });
-          const getData = (getResult && getResult.Data) || getResult;
-          if (getData && getData.CustomerUser) {
-            const u = getData.CustomerUser;
-            ticket.customer_first = u.UserFirstname || '';
-            ticket.customer_last = u.UserLastname || '';
-            ticket.customer_email = u.UserEmail || '';
-            ticket.customer_phone = u.UserPhone || '';
-
-            // 3. Store in SQLite cache for subsequent detail queries
+          // 2. Fallback to live API fetch (only if login doesn't contain spaces)
+          let targetLogin = ticket.customer_user_id;
+          if (targetLogin.includes(' ')) {
             try {
-              db.prepare(`
-                INSERT INTO customer_user_cache (login, email, first_name, last_name, customer_id, phone)
-                VALUES (?, ?, ?, ?, ?, ?)
-                ON CONFLICT(login) DO UPDATE SET
-                  email=excluded.email,
-                  first_name=excluded.first_name,
-                  last_name=excluded.last_name,
-                  customer_id=excluded.customer_id,
-                  phone=excluded.phone
-              `).run(
-                u.UserLogin,
-                u.UserEmail || '',
-                u.UserFirstname || '',
-                u.UserLastname || '',
-                u.UserCustomerID || '',
-                u.UserPhone || ''
-              );
-            } catch (cacheErr) {
-              console.warn('[LDAP Cache Detail] Failed to write fetched user to SQLite cache:', cacheErr.message);
+              const sRes = await otrsRequest('POST', '/CustomerUserSearch', { Search: `*${targetLogin}*`, Valid: 1 });
+              const sData = (sRes && sRes.Data) || sRes;
+              if (sData && sData.CustomerUserID) {
+                targetLogin = Array.isArray(sData.CustomerUserID) ? sData.CustomerUserID[0] : sData.CustomerUserID;
+              }
+            } catch (_) {}
+          }
+
+          if (targetLogin && !targetLogin.includes(' ')) {
+            const getResult = await otrsRequest('POST', '/CustomerUserGet', { UserLogin: targetLogin });
+            const getData = (getResult && getResult.Data) || getResult;
+            if (getData && getData.CustomerUser) {
+              const u = getData.CustomerUser;
+              ticket.customer_first = u.UserFirstname || '';
+              ticket.customer_last = u.UserLastname || '';
+              ticket.customer_email = u.UserEmail || '';
+              ticket.customer_phone = u.UserPhone || '';
+
+              // 3. Store in SQLite cache for subsequent detail queries
+              try {
+                db.prepare(`
+                  INSERT INTO customer_user_cache (login, email, first_name, last_name, customer_id, phone)
+                  VALUES (?, ?, ?, ?, ?, ?)
+                  ON CONFLICT(login) DO UPDATE SET
+                    email=excluded.email,
+                    first_name=excluded.first_name,
+                    last_name=excluded.last_name,
+                    customer_id=excluded.customer_id,
+                    phone=excluded.phone
+                `).run(
+                  u.UserLogin,
+                  u.UserEmail || '',
+                  u.UserFirstname || '',
+                  u.UserLastname || '',
+                  u.UserCustomerID || '',
+                  u.UserPhone || ''
+                );
+              } catch (cacheErr) {
+                console.warn('[LDAP Cache Detail] Failed to write fetched user to SQLite cache:', cacheErr.message);
+              }
             }
           }
         }
@@ -940,9 +957,19 @@ router.patch('/:id', async (req, res) => {
       if (updates.responsible_user_id !== undefined) ticketFields.ResponsibleID = updates.responsible_user_id;
       if (updates.type_id !== undefined) ticketFields.TypeID = updates.type_id;
       if (updates.title !== undefined) ticketFields.Title = updates.title;
-      if (updates.ticket_lock_id !== undefined) ticketFields.LockID = updates.ticket_lock_id;
+      if (updates.customer_user_id !== undefined && updates.customer_user_id !== null && updates.customer_user_id !== '') {
+        try {
+          const match = db.prepare(`SELECT login, customer_id FROM customer_user_cache WHERE login = ? OR (first_name || ' ' || last_name) = ? COLLATE NOCASE`).get(updates.customer_user_id, updates.customer_user_id);
+          if (match) {
+            updates.customer_user_id = match.login;
+            if (!updates.customer_id && match.customer_id) {
+              updates.customer_id = match.customer_id;
+            }
+          }
+        } catch (e) {}
+        ticketFields.CustomerUser = updates.customer_user_id;
+      }
       if (updates.customer_id !== undefined && updates.customer_id !== null && updates.customer_id !== '') ticketFields.CustomerID = updates.customer_id;
-      if (updates.customer_user_id !== undefined && updates.customer_user_id !== null && updates.customer_user_id !== '') ticketFields.CustomerUser = updates.customer_user_id;
 
       // If ticketFields is empty but we have a note or timeUnit to log, supply a dummy field (StateID) so Ticket is not empty
       if (Object.keys(ticketFields).length === 0 && (hasNote || (!isNaN(timeUnit) && timeUnit > 0))) {
@@ -1673,9 +1700,19 @@ router.patch('/batch/update', async (req, res) => {
       if (updates.queue_id !== undefined) ticketFields.QueueID = updates.queue_id;
       if (updates.type_id !== undefined) ticketFields.TypeID = updates.type_id;
       if (updates.user_id !== undefined) ticketFields.OwnerID = updates.user_id;
-      if (updates.responsible_user_id !== undefined) ticketFields.ResponsibleID = updates.responsible_user_id;
-      if (updates.customer_id !== undefined) ticketFields.CustomerID = updates.customer_id;
-      if (updates.customer_user_id !== undefined) ticketFields.CustomerUser = updates.customer_user_id;
+      if (updates.customer_user_id !== undefined && updates.customer_user_id !== null && updates.customer_user_id !== '') {
+        try {
+          const match = db.prepare(`SELECT login, customer_id FROM customer_user_cache WHERE login = ? OR (first_name || ' ' || last_name) = ? COLLATE NOCASE`).get(updates.customer_user_id, updates.customer_user_id);
+          if (match) {
+            updates.customer_user_id = match.login;
+            if (!updates.customer_id && match.customer_id) {
+              updates.customer_id = match.customer_id;
+            }
+          }
+        } catch (e) {}
+        ticketFields.CustomerUser = updates.customer_user_id;
+      }
+      if (updates.customer_id !== undefined && updates.customer_id !== null && updates.customer_id !== '') ticketFields.CustomerID = updates.customer_id;
 
       // Auto sblocco check
       if (updates.ticket_state_id) {