Investment Program fields in TCode CJ11

Hi Experts,

Currently I'm facing an issue loading the IM fields of CJ11 that belongs to WBS level 1.

Field name: Investment Program

Table/Structure: RAIP1

Field Name: PRNAM

Field name: Approval year of the Investment Program

Table/Structure: RAIP1

Field Name: GJAHR

Field name: Position ID

Table/Structure: RAIP1

Field Name: POSID

I have a dirty way to load them but I would like to do it properly. The answer that I found is to modify the BAPIs to get these fields. Any advise on how to do it?

Cheers,

RR