Hi Dawn,
The problem appears that our Field Verification is too good...
In the Options under the File Menu, there is a setting called Field Verification that makes sure that when you type in a code (customer, distrubution, GL account, etc), if you mistyped and that code doesn't exist, a warning will appear. It seems that for some reason the field verification is checking for a non-blank Control Account Set, which of course is not necessary for Misc Cash.
If you remove the Field Verification setting from Options, I was able to save a Misc Cash entry with a blank Control Account set, using the newest Receivables 6.8B.
I'm assuming you used Field Verification in a previous release, and didn't have to enter a control account. Should that be the case, this would be something to forward on to the programmers.