Lookup BW Infoprovider values from BPC

Hi Experts,

I am on BPC 10.0 NW SP16.

   I have a scenario wherein SD & MM Contract rates are maintained in ECC and loaded into BW. I have an option of maintaining a rates model in BPC and load these rates into BPC from BW infoprovider. I want to load rates by looking up BW infocubes than another BPC Rates cube.

Basically, I want to avoid loading rates through DM package and lookup rates on BW infoprovider from a custom BAdI. Any ABAP method suggestion is welcome.

Regards,
Draksh