Manuelle Buchungen Select ohne Leerwert absichern

frontend/pages/accounting/manual-bookings.vue

@@ -16,7 +16,7 @@ const expandedDebitGroups = ref([])
 const expandedCreditGroups = ref([])
 
 const DATEV_TAX_KEY_ITEMS = [
-  { value: "", label: "Ohne Steuerschlüssel" },
+  { value: "__none__", label: "Ohne Steuerschlüssel" },
   { value: "9", label: "9 - Vorsteuer 19 %" },
   { value: "8", label: "8 - Vorsteuer 7 %" },
   { value: "19", label: "19 - EU Vorsteuer 19 %" },
@@ -28,7 +28,7 @@ const form = reactive({
   amount: null,
   debit: "",
   credit: "",
-  datevTaxKey: "",
+  datevTaxKey: "__none__",
   description: ""
 })
 
@@ -196,7 +196,7 @@ const resetForm = () => {
   form.amount = null
   form.debit = ""
   form.credit = ""
-  form.datevTaxKey = ""
+  form.datevTaxKey = "__none__"
   form.description = ""
   debitSearch.value = ""
   creditSearch.value = ""
@@ -215,7 +215,7 @@ const saveBooking = async () => {
     const payload = {
       manualBookingDate: form.manualBookingDate,
       amount: Number(form.amount),
-      datevTaxKey: form.datevTaxKey || null,
+      datevTaxKey: form.datevTaxKey === "__none__" ? null : form.datevTaxKey,
       description: form.description || "Manuelle Buchung",
       ...buildSidePayload(form.debit, "debit"),
       ...buildSidePayload(form.credit, "credit")