ABAP dump when attempting to Approve Working Times

Hello,

I am attempting to configure the Manager Self-Service, Approve Time Sheet functionality and running into an ABAP error I don't understand.  When in the Approve Time Sheets iView, I can see the employee's submitted time.  When I change the Approval drop down to Approve All and click on the Save button, I get a portal error.

Here's the ST22 report.

Now, I've seen several posts about the GETWA_NOT_ASSIGNED error and they talk about the field catalog, however none address this error as it applies to this program CL_HRMSS_AS_CATS_APPROVAL.  Can anyone shed some light on how to fix this problem or point out maybe where I've missed some configuration?  What is the field catalog being built from?

Kind Regards,

Garrett