Bex Cmod variable doesn't reflect in the Bo?

Hi Experts,

I have created variable in the BEx. I have scheduled the report in the Business object but the variable value is not reflecting in the Business object.

Example:

I have created variable in Bex. Based on Bex current month  variable value should populate. but  when each month the report in Business object value does not showing current month. Each time have to change the Prompt.