Create dummy variable with 31 rows

Hi All,

I am having an issue with the data in the webi report.

I am having a crosstab, with 3 dimensions and 1 measure

[Current Month],[Product],[Item],[Sales]

I am using the above block to create a dashboard using BI Webservices

My issue is, because of the "Current Month", my total comumns will change every month, like for jan 31 columns, feb 29 columns, march 31 columns.

Because of the dynamic columns my dashboard failing. (need to map the columns every month)

I want to create a dummy variable in webi or at universe level, to restrict the table block for 31 columns.

Any way to create a dummy variable with 31 rows???

Thanks