refactor: refs #6724 Minor change

db/routines/vn/procedures/invoiceInTax_getFromEntries.sql

@@ -4,16 +4,9 @@ BEGIN
 	DECLARE vRate DOUBLE DEFAULT 1;
 	DECLARE vDated DATE;
 	DECLARE vExpenseFk VARCHAR(10);
-	DECLARE vIsBooked BOOLEAN DEFAULT FALSE;
 
-	SELECT isBooked INTO vIsBooked  
-		FROM invoiceIn ii 
-		WHERE id = vInvoiceInFk;
+	CALL invoiceIn_checkBooked(vInvoiceInFk);
 
-	IF vIsBooked THEN 
-		CALL util.throw('A booked invoice cannot be modified');
-	END IF;
-	
 	SELECT MAX(rr.dated) INTO vDated
 		FROM referenceRate rr
 			JOIN invoiceIn ii ON ii.id = vInvoiceInFk