How do I apply a partial credit to an invoice? B1

SAP B1 environment  - Is it imaginable to manually use a partial recognition memo to an invoice? Example $100 invoice, $10 recognition memo and use the recognition memo to the invoice leaving a $90 equilibrium to beryllium paid connected the invoice... I person not received immoderate wealth from the customer.

In the BP  <Account Balance> surface if I prime <Internal Reconciliation> connected the bottommost close it lone allows maine to use recognition to invoice if it's an nonstop match. 
thanks