Mapping Expression with SysRevID is invalid

When I try to create an Updatable Dashboard and save I always get an error with the SysRevID field. It says Mapping expression for (AnyTable).SysRevID field is invalid: REsult of expression cannot be assigned to variable of “System.String” type. This happens on different tables. It is always the sysRevID field. A temp fix is to delete this field in the Object to Query Column Mapping Output list. Then I can save and analyze and test. However, it gets put back in and errors out by the system.

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This happens everytime in an updatable BAQ. I just delete the column in the Query to Object Mapping everytime and then save.