Symptom: When attempting to do a Mass Update, it produces this error message: "Item Mass Update exception loading: Combos Exception of type 'Wasp.DataAccess.WtDbException' was thrown."

The log file will also contain these two errors:

Column name not found: tax_code

Item Mass Update exception loading: Combos Exception of type 'Wasp.DataAccess.WtDbException' was thrown.

Cause: The tax_code column is only available in the Professional or Enterprise editions of the program. Mass Update should not be attempting to access that column.

Resolution: Browse to C:\Program Files (x86)\Wasp Technologies\InventoryControl and rename WaspInventoryRules.dll to OriginalWaspInventoryRules.dll, then download and extract this replacement file into that directory: https://dl.waspbarcode.com/wasp/supportfiles/WaspInventoryRules.zip