Prevent cash receipting users from settling customer remittances to specific bank accounts

Summary:

Our client operates a centralised cash receipting process. The cash receipting users will have access to legal entities to create cash remittances across several countries. Some legal entities will operate multiple bank accounts. Legal entities and BU's map one to one. We have couple of requirements from a control standpoint as bank accounts are ringfenced for regulatory reasons.

1/ the business requires invoices raised in a specific legal entity to be settled into a bank account that is owned by that legal entity. How do I achieve this?

2/ is there a functionality to prevent user access to remit cash receipts into specific bank accounts? This security need to apply to manual cash receipts as well as lock box receipts..