How to arrange variable in Filter.

Dear Experts,

We have created filter FL1 object in transaction RSPLAN.

in filter we have variables

calmonth1

Material1

This filter is used in Planning sequence PS1. When we execute PS1 variable popup appears as below sequence:

calmonth1

material1

But we need to change this sequence as below:

material1

calmonth1

How do we achieve this.

Thanks in Advance.

Best Regards,

Abhishek