How to enable one parameter & to disable another by using different tx'n

Hi all,

Could you please shoot out my doubt :

By using different transactions(Tx'n-A & Tx'n-B) how can we enable & disable parameters in one selection screen .(These two transactions are using to access same selection screen)

Example: we have created two parameters p1 & p2 in one selection screen.

If you are using transaction (Tx'n-A) p1 should be enabled & p2 should be disabled

If you are using transaction (Tx'n-B) p2 should be enabled & p1 should be disabled.

Could you please exaplain the process.Thanks in Advance.

Regards,

Ranjith.