Parameter Help

I have a requirement to display a list of values for a parameter decalred as follows:

PARAMETERS: KSCYC LIKE T811C-CYCLE OBLIGATORY.

The problem I have is a don't get a list of values to chose from. I then created an internal table called ISELOPT that contained all of the values from T811C-CYCLE and had my parameter defined as

DATA: BEGIN OF ISELOPT OCCURS 0,

CYCLE LIKE T811C-CYCLE,

END OF ISELOPT.

PARAMETERS: KSCYC LIKE ISELOPT-CYCLE OBLIGATORY.

I still can't get the list of values to be selected from at the selection screen. Can someone tell me how to get my parameter to show me all of the values from T811C-CYCLE?