only parking option in t-code: F-22

Dear Gurus,

I have a requirement wherein in T-code: F-22 only PARK option should be there.

When the client posts any document through F-22 all the documents should be PARKED instead of posting when saving.

we have tried to disable the post option,but even PARK option is disabled.

any help on this really appreciated.

Regards,

Ranjith kumar.