Set parameter ID

Hi

I need to call MIGO Transaction defaulting the Order Number. The Order Number is attached to PARAMETER ID 'ANR'.

So I used

SET PARAMETER ID 'ANR' FIELD order_value.

CALL TRANSACTION 'MIGO'.

Even though order_value has a valid order number, the MIGO screen is not defaulting with the Order Number.

Any Suggestions on what cud have gone wrong.