Reason: A blank record exists in the InventItemPrice table for the company which you are currently logged in as. A validation occurs in the InventTableModule\validateField method which checks if a record exists, since it finds a blank record the Unit of Measure value cannot be saved.
Workaround: Remove the record from the InventItemPrice table which has a blank value for the ItemID field and the DataAreaId match the company you are currently logged in as.
How it possibly could have occurred...(read more)
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