Can a User add multiple lines to a Credit Memo?
Question:  Can a User add multiple lines to a Credit Memo?

Answer:  User can NOT add more than one line item per Credit Memo, because the GL account numbers are fixed by the Sales Order and the System Setup. There are additional lines available for the additional charges associated with a line, or multiple lines from the original invoice.  

A General CM is usually for a generic credit to the customers account. It is not linked to any specific order or invoice, it is just a one line entry for one amount, so there is no need to have more than one item in this scenario. Therefore the one line item that is entered on a General CM has to be related to the one GL account that is entered in the header of the General CM.

There have been requests in the past to allow users to enter more than one item on a General Credit Memo. But upon review of the code and tables it would require more data entry from the end users to enter the same information multiple times. Additionally, we would have to completely re-write the CM module and other accounting modules to implement this request. At this point in time the amount of effort to implement this change outways the initial request.