Same as before - adding a step that results in a query that is not supported in DriectQuery mode.
Its not an error as such though its not much use either.
Copying the col does this (different field used for example) -
Can see the data type has been detected as Alphanumeric in the new field even if contetns not visible in query view.
Doing similar on the association Location dimension will allow a join between the two new copied columns.