OBIEE Error - Concat does not support non-text types

In oracle concatenation can be done between non character types however while concatenating no character types in BI it is not supported.

Here is a workaround;

This can be done by casting the Non Charater Type to character types

e.g

cast(Periods."Month" as varchar(10))

cast(Periods."Year" as varchar(10))||'/'||cast(Periods."Month" as varchar(10))