[Guided Decision Table] Invalid error message when renaming bound variable name in conditional BRL column.

If a condition BRL column is added to a DT with bound variables that are used in an action column and that variable name is subsequently changed, the attached error message occurs when updating the action column with the new variable name. In the attached message the original variable name is 'app'. Hitting 'ok' returns you to the DT which has actually refactored the DT with the new variable name and validation is successful.