BAPI or Function module to change custom coding block fields in accounting documents (FB02/FB09)

Hi,

My requirement is to change some of the custom coding blocks for a list of accounting documents so the balance carry forward process doesn't create too many entries.

I understand we could use BDC by enabling the coding block fields for input. However, I am looking for a BAPI or any function module that will change custom coding block (z coding blocks).

I have checked FI_DOCUMENT_CHANGE and FI_ITEMS_MASS_CHANGE but these FMs doesn't allow coding block fields change.

Any help much appreciated.