DMT - Update Receipt Date

Hi there!
I’m trying to use DMT to update the Receipt Date on a receipt line.
I used the PO Receipt Combined option to update the Receipt Header date but now when I try and update a line, it tells me the record isn’t found.
I’m assuming it’s something easy I’m missing in this new combined thing.
Any ideas?

Did you remember to uncheck Add New and only use Update? I always miss that!

I’m 98% sure I did but I can try it again lol