feat: flag adjusted tax in DATEV export

backend/src/utils/export/datev.ts

@@ -80,6 +80,20 @@ const formatDatevDate = (date: dayjs.ConfigType, format: string) => {
     return parsed.isValid() ? parsed.tz(DATEV_TIMEZONE).format(format) : "";
 };
 
+const getIncomingInvoiceTaxReview = (account: any) => {
+    const taxRate = account.taxType === "19" ? 19 : account.taxType === "7" ? 7 : null;
+    if (taxRate === null) return null;
+
+    const amountNet = Number(account.amountNet);
+    const amountTax = Number(account.amountTax);
+    if (!Number.isFinite(amountNet) || !Number.isFinite(amountTax)) return null;
+
+    const calculatedTax = Number((amountNet * (taxRate / 100)).toFixed(2));
+    if (Math.abs(amountTax - calculatedTax) < 0.005) return null;
+
+    return `USt pruefen ${displayCurrency(amountTax, true)}`;
+};
+
 const getCreatedDocumentRevenueLines = (document: any) => {
     const totals = getCreatedDocumentTotal(document);
 
@@ -369,7 +383,8 @@ export async function buildExportZip(
 
                 let amountGross =/* account.amountGross ? account.amountGross : */(account.amountNet || 0) + (account.amountTax || 0);
                 let shSelector = Math.sign(amountGross) === -1 ? "H" : "S";
-                let text = `ER ${ii.reference}: ${escapeString(ii.description)}`.substring(0,59);
+                const taxReview = getIncomingInvoiceTaxReview(account);
+                let text = `${taxReview ? `${taxReview} - ` : ""}ER ${ii.reference}: ${escapeString(ii.description)}`.substring(0,59);
                 const vend = ii.vendor; // durch Mapping verfügbar
 
                 bookingLines.push(`${Math.abs(amountGross).toFixed(2).replace(".",",")};"${shSelector}";;;;;${accountData.number};${vend?.vendorNumber || ""};"${buschluessel}";${formatDatevDate(ii.date, "DDMM")};"${ii.reference}";;;"${text}";;;;;;${file ? `"BEDI ""${file.id}"""` : ""};"Geschäftspartner";"${vend?.name || ""}";"Kundennummer";"${vend?.vendorNumber || ""}";"Belegnummer";"${ii.reference}";"Leistungsdatum";"${formatDatevDate(ii.date, "DD.MM.YYYY")}";"Belegdatum";"${formatDatevDate(ii.date, "DD.MM.YYYY")}";;;;;;;;;;"";;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;0;;;;"";;;;;;;`);