Passing Multiple characters from prompt to filters using presentation variable in OBIEE 11g

Create report in which user wants to pass multiple characters(values) from prompts directly to column filter.
So I have used below syntax with filter functions. And the reports returned results as expected.

(“- Table Name”.”Column name “ IN ( @{Variable}[‘@’]{‘Default Value’} )


Example: Per_Name_Month in ( @{p_month}['@']{'2015 / 07'} ) 
If you selected Per Name Month are 2015 / 08 and 2015 / 09, then result: 

Per_Name_Month in ( '2015 / 08','2015 / 09' )