Problem with Setting Parameter ID's to ME55 Screen fields

Hello Technocrats,

I have a small problem related to "Setting Parameter ID's (eg. Purchase Requisition field) to the initial screen of ME55 transaction".

My scenario is like follows:

I have a Z program where i am listing all the Purchase Requisitions. Whenever the user selects a single Purchase Requisition and click a button called "Rel.Pur.Req" from the application tool bar, we should take him to the initial screen of ME55 carrying "purchase requisition number" with us and to set the same to the respective field.

I failed to do the same with "SET Parameter ID ...." statement.

Please suggest me is there any other option to do this.

Or -

Is it possible for ME55 transaction or not.

Thanks in advance,

Lakshmi.