SAP Menu Path :-
SAP Menu –> Accounting –> Financial Accounting –> Accounts Receivable –> Account -> Correspondence –> Assignment –> Process Assigned Items ( Process Assignment of Open Items )

Process Assignment of Open Items
SAP Menu –> Accounting –> Financial Accounting –> Accounts Receivable –> Account -> Correspondence –> Assignment –> Process Assigned Items ( Process Assignment of Open Items )
Process Assignment of Open Items