[GNC] Deleting split, specifying one expense account

[Rich Shepard]

This used to work for me, but not today.

The last transaction in the checking account for groceries was entered as a
split because I took cash back (which displays in the cash register). Now I
have a cash groceries transaction, but gnucash won't let me delete the split
and enter only the credit for the groceries account.

What am I doing incorrectly?

TIA,

Rich