I open receipt 1, combined it with another receipt, deleted the lines I didn't want and posted it to invoice. I can still open receipt 1 and print it. It shows the line that's invoiced in red and the other lines in black.

I did the same thing with receipt 2, combined it with another receipt, deleted the lines I didn't want and posted it to invoice. When I try to open receipt 2 it says, "There are no unadjusted delivery notes on this receipt". I can't print it because it says there is no data. It shows the lines that are not invoiced in red and the invoiced line in black.

What did I do wrong?