Checks by A/P Vendor class

We have set some vendors as "emp" with the account codes set for cash and accounts payable.

We have selected the vendor class "emp" as a batch to run all employee expense checks.

When we try to print we get an error message:

Distributions for this transaction contain errors.  This transaction contains errors.  It won't be posted.  No account has been specified for one or more distributions.

The Computer checks edit list shows each employee account with the following distribution:

Cash -----

A/P 9900-999-99-999-99-2010

Other than setting up the cash account in the Vendor class setup where should this information be added?

Thank you!