Obbliga conferma movimenti barcode con tasti funzione

barcode_client.py

@@ -519,11 +519,12 @@ class BarcodeClientApp:
 
     def _on_destination_enter(self, _event=None) -> str:
         pallet = str(self.scanned_var.get() or "").strip()
-        destination = str(self.destination_var.get() or "").strip()
-        if pallet and destination:
-            self._submit()
-        else:
+        if not pallet:
             self._focus_primary_input()
+        else:
+            self.info1_var.set("F3 per associare, F4 per disassociare")
+            self.status_band.configure(bg=self._status_colors["yellow"])
+            self._focus_destination_input()
         return "break"
 
     def _on_unload_key(self, _event=None) -> str: