看看這種錯誤訊息的一個例子：

combination reference table/field XXX does not exist

![](https://img-blog.csdnimg.cn/img_convert/5079985c050cd903661d9709e585b27a.png)

引起錯誤的欄位型別為LOSMENGE，欄位名為INSLO:

![](https://img-blog.csdnimg.cn/img_convert/43a07f84a5fcc684c1b71e55f85ce24e.png)

該欄位的基本資料型別(Data Type)為 QUAN，長度為13.

根據[ABAP幫助文件](https://help.sap.com/doc/abapdocu_750_index_htm/7.50/en-US/abenddic_quantity_field.htm), QUAN型別需要和某種單位欄位結合在一起，用於描述實際業務流程中的數量，比如 一本書，一件啤酒，一捆繩子等等。

> A quantity field is a component of a structure, database table, or view of type QUAN defined in ABAP Dictionary, used to include a quantity in a specific unit. A quantity field must be associated with a unit key of a structure, database table, or view which determines the unit and the number of fractional digits. A unit key is a component of a structure, database table, or view of type UNIT defined in ABAP Dictionary and can contain a unit ID from the database table T006.

按照ABAP幫助文件裡的規定，型別為QUAN的欄位，必須設定一個型別為 UNIT 的欄位作為單位，二者共同描述“數量”這個概念，缺少單位，數量單位的語義就不完整。

![](https://img-blog.csdnimg.cn/img_convert/0500d5b684cd69cadb462567491282ff.png)

> A data element of data type QUAN is handled as a field of data type DEC and is stored in database tables in the BCD format. When creating a data element or a structure component of the data type QUAN in the ABAP Dictionary tool, any number of fractional digits can be defined. The default value is no fractional digits.

For every structure component of data type QUAN, a component of the same structure or of a different structure, database table, or view must be specified in the individual editing of the component as a reference field, which has the data type UNIT. This field is the unit key which determines the unit of the quantity. From a technical perspective, the data type UNIT is handled like a type CHAR with length 2.

ABAP 資料結構啟用時的錯誤訊息 - combination reference table field does not exist

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