BAPI/FM to create internal order with investment program

Hi Experts,

We have a requirement to automate create internal order(KO01) with investment program.

I could find a BAPI BAPI_INTERNALORDER_CREATE but realised that there is limitation .

'Investment management fields are also not supported.'

As per our system configuration investment program is mandatory so using this BAPI wouldn't help.

Please suggest on any BAPI/FM for this purpose ( Using BDC would be last option ).

Note : I did my initial investigation in SDN and googled too,but no luck.

Regards

Pallavi