fix(documents): restrict advance invoice creation to projects

frontend/components/EntityShowSubCreatedDocuments.vue

@@ -124,6 +124,16 @@ const invoiceDeliveryNotes = () => {
   router.push(`/createDocument/edit?type=invoices&loadMode=deliveryNotes&linkedDocuments=[${props.item.createddocuments.filter(i => deliveryNoteLikeDocumentTypes.includes(i.type)).map(i => i.id)}]`)
 }
 
+const createAdvanceInvoice = () => {
+  if (props.topLevelType !== 'projects' || !props.item.id) return
+
+  const query = new URLSearchParams(props.queryStringData)
+  query.set('type', 'advanceInvoices')
+  query.set('loadMode', 'advanceInvoice')
+  query.set('project', props.item.id)
+  router.push(`/createDocument/edit?${query.toString()}`)
+}
+
 const showFinalInvoiceConfig = ref(false)
 const referenceDocument = ref(null)
 const advanceInvoicesToAdd = ref([])
@@ -169,6 +179,13 @@ const selectItem = (item) => {
       >
         Dokument aus Vorlage
       </UButton>
+      <UButton
+          v-if="props.topLevelType === 'projects'"
+          icon="i-heroicons-plus"
+          @click="createAdvanceInvoice"
+      >
+        Abschlagsrechnung
+      </UButton>
       <UButton
           @click="showFinalInvoiceConfig = true"
           v-if="props.topLevelType === 'projects'"