Receiving 0 as a transaction doesn’t make sense logically, you aren’t moving any inventory, so receipt isn’t going to work.  If there is nothing to be returned and nothing to be credited for that line, then I believe Cancelling the line is the only way to move the RMA to closed.  If however there is a need to provide some credit, you will need a non-inventory sales part item you can use for the purpose of attaching a credit value.

If this is just cleanup of old open RMAs, cancelling the line is the most straightforward.  It won’t delete the line, the record will still be there, but it will allow the header status to go to Completed.

Thanks, I am trying to find out how they have managed to put a 0 line on

Oh that….just users being lazy really.

From the customer order header, RMB to Handle Return Material Authorization > Create.  This will create the RMA with the full list of lines.  Go down through the lines on the RMA in Planned state and you can change any one of them to 0 qty (non-sensical really, Delete would be better - but you can do either in Planned.  Release the RMA - now you are stuck with the 0 qty line.

No process reason to do it this way, but someone seems to think that means something more than Delete.