R42800 Generating Work Center Error - Tax Area Required

When running the R42800, it is throwing a Work Center error - "Error - Tax Area Required" for just a couple of Sales Orders.

Before I open a SR, are there any other places to look for bad data in a step/table or something obscure?

Typically the SO for this type goes through a fairly standard process - Create SO, Print Pick Slips, Ship Confirm, Print Invoice, Sales Update.

Here are some highlights...

• It's throwing two lines of errors in the WC. One referencing the F0911FSEditLine and one for the F03B11EditLine.
• Other SO's with the same Customer #, Branch Plant, SO Doc Type, Line Types, Item #'s and GL Class codes have processed through SO Update with no issues - even some that were created on the same date, invoiced on the same date, etc.