How to Assign Role Group to Business Partner using any BAPI or FM...

Hi All

I have a requirement like Assign Role Group not a Role to BP.

Actually I am creating BP using Bapi that is BUPA_CREATE_FROM_DATA after that I am using BUPA_ROLE_ADD_2 to assign a role to a BP.

But I have to assign Role Group to BP. Is any FM or BAPI exists to assign Role Group.

Please suggest me ASAP.

Thank you all