how to write a FOX code for a condition, in planning package

Hi Experts,

I have created a planning package going to t-code bps0 and there i have to filter certain keyfigures using below logic:

Pricing Start Date (0CRM_MKTELM_EUTPC007)>= current day <= Pricing End Date (0CRM_MKTELM_EUTPC009).

I am wondering if I could do that using selection tab of planning package or do I need to write a fox code for same.

If a code needs to be written,please suggest me about the FOX code as I am very much new to FOX as well as BPS.

Thanks,

Dolly