应付发票：单据来源必须有来源单据

代码示例

IF @object_type = '18'
	BEGIN
		IF @transaction_type = 'A'
			BEGIN
				IF EXISTS (
					SELECT T1.[BaseEntry]
					FROM OINV T0
						INNER JOIN INV1 T1 ON T0.[DocEntry] = T1.[DocEntry]
					WHERE   T1.[BaseEntry] IS NULL 
						AND T0.DocEntry = @list_of_cols_val_tab_del
				)
					BEGIN
						SET @error = 181;
						SET @error_message = '应收发票必须有来源单据 ！';
					END;
			END;
	END