passing 2 values to drill through won't work

[Cog_rookie]

Hi all,

I am trying to pass 2 values to drill through from a source report which contains A and B and am trying to pass these 2 values on to another target report which will then be passed again to another target report.

I am using their MUN to pass their values from one report to another but it seems its not doing what I am trying to achieve.

When clicking the drill down at A it asks for B passed value and vice - versa.

Any one please help.