PO Charge account default for inventory items using item cost category

Summary

PO Charge account default for inventory items using item cost category

Content

Hi,

I created a mapping set under Purchasing and selected input source as Costing Category name (under Cost management application source). I used this mapping set in my TAB PO Charge account rule. When, i try to activate TAB, it gets into error but no error message is received.

Is it not possible to use input source of other application in a mapping set and use that under Purchasing TAB?