采购收货单：必须有来源单据

示例代码

--采购收货单：必须有来源单据
IF @object_type = '20'
	BEGIN
		IF @transaction_type = 'A'
		OR @transaction_type = 'U'
			BEGIN
				IF EXISTS (
					SELECT T1.[BaseEntry]
					FROM OPDN T0
						INNER JOIN PDN1 T1 ON T0.[DocEntry] = T1.[DocEntry]
					WHERE T1.[BaseEntry] IS NULL
						AND T0.DocEntry = @list_of_cols_val_tab_del
				)
					BEGIN
						SET @error = 201;
						SET @error_message = '采购收货单必须有来源单据于订单';
					END;
			END;
	END