How to create the filter to read from actual cube and write to plan cube

Hi,

I am using Integration Planning fox formula.

If I want to based on the plan cube using FOREACH 0FISCPER to get the Actual Cube's keyfigure and do some calculation then write to plan Cube. How can I use the filter for infoprovider? Should I put Plan Cube in the filter or Actual Cube in the filter, or both in the filter?

Thanks!

Dongkai