往会计凭证行项目fbl3n、fagll03添加BKPF或者BSEG表里有的科目，直接在后台配置之后，前台查询结果的布局中放出字段即可。

如果是BKPF和BSEG没有的字段，需要BTE增强。

You can use RFPOS structure and BTE(1650) to add new fields to show in FBLXN tcodes.

Solution: We can use openFI 1650 (BTE) to add any fields to ALV output list in FBL3N/FBL1N/FBL5N at the same time.

SAP has already provided the place for Open FI BTE (1650) in the standard program that will trigger the custom function module assigned to the event 1650 in FIBF T-code.

FBL3N:  G/L Account Line Item Display

FBL1N:  Vendor Line Item Display

FBL5N:  Customer Line Item Display

具体参考如下log：

https://blogs.sap.com/2012/08/30/enhancing-sap-standard-transactions-fbl3nfbl1nfbl5n-with-extra-fields-in-the-output-list-via-bte/