Hi Yash,
1. Accounting Clerk as a collection Specialist :
a. Define the collection group and assign the accounting Clerk as a specialist in the collection group . Transaction : UDM_GROUP
b. Assign collection group to the collection segment . Transaction: UDM_GROUP2SGMT
c. Create BP with the required roles like : FLCU00 ( Customer ) , 0000000(General BP ) , UDM000 ( COLLECTION MANAGEMENT )
d. under role : UDM000 -> collection profile tab -> Enter the collection profile defined , the collection group & the collection specialist ( accounting clerk in your case.
Regards,
Pallavi