How to restrict the standard domain fixed values in a search help

Hello experts,

i'm using the parameters in my abap report as shown as below:

PARAMETERS: p_freq TYPE ACE_RHYTHM.

This DomainL ACE_RYTHM contains following values as shown as below:

But i need only the values of M, Q, H and Y should be shown in f4 help for user selection. How to restrict it?

Any suggestions please...

Thanks in advance