How to add a BSEG custom field to FB01 for customer and vendor accounts?

[sengelbr]

Dear SAP pros,

I have the requirement to add a BSEG custom field to FB01 for customer and vendor accounts. The new general ledger is used

By so far:

1. I added the new field via OXK3 into structure CI_COBL.
2. I created a subscreen in OXK1.
3. In OB32 I inserted some entries:

space | space | BSEG-ZZFIELD
space | space | COBL-ZZFIELD
A | space | BSEG-ZZFIELD
A | space | COBL-ZZFIELD
D | space | BSEG-ZZFIELD
D | space | COBL-ZZFIELD
D | A | BSEG-ZZFIELD
D | A | COBL-ZZFIELD
D | X | BSEG-ZZFIELD
D | X | COBL-ZZFIELD
K | space | BSEG-ZZFIELD
K | space | COBL-ZZFIELD
K | A | BSEG-ZZFIELD
K | A | COBL-ZZFIELD
K | X | BSEG-ZZFIELD
K | X | COBL-ZZFIELD
S | space | BSEG-ZZFIELD
S | space | COBL-ZZFIELD

After this the field was still not editable.
4. To make the field editable I inserted an entry into table TCOBX: ZZFIELD (tcobx-Field) SAPMF05L (tcobx-modul) 0300 (tcobx-dynnr) 001(tcobx-group3). This worked but not for customers and vendors.(https://archive.sap.com/discussions/thread/3397276).

In G/L account item the field is display as required:

The custom field is not defined as movement field (SAP note 1497601).
SAP note 1607020 says that new fields cannot be used for customer and vendor accounts.

Is there any way to display the field for customer and vendor accounts?

Thank you in advance for your help!

[raymond_giuseppi]

Did you look at the BAdIs like BADI_FDCB_SUBBAS* (hoping to find one yet available, one implementation only per BAdI and SAP use most)

If not, read BAdi BADI_FDCB_SUBBAS01 documentation, those BAdI allows input of data to document header or customer or vendor item, but only available in some transactions such as MIRO or FB60, FB65, etc.