Functional Module to check Budget in SRM

Hi,

My client at present the budget is checking at time of PR creation with account assignment WBS. Now they are implemented SRM.

Now the budget has to check at the time of creation of catalogue in SRM instead of PR creation.

Please help us to find out which functional module is calling in PS to check the budget. So that we can call the same functional module to check the budget in SRM also.

Thanks in advance for your help.

With regards,

V.krish