Assingning Charges to a Purchase Order Partially Received

I have an issue regarding an Purchase Order, that has been partially received and the charges have not been assigned to the full quantity.

I have no idea on how to solve this…

Nelson,

It is possible to assign (Charge (Item)) amounts later, to already posted Reciepts.

Create new PO/PI with only one line of type Charge (Item)
In Item charge Assignment form use Functions / Get Receipt Lines…