BAPI_ALM_ORDER_MAINTAIN - Deleting a Constraint date?

Hi all,

Can I delete constraint type and date with BAPI_ALM_ORDER_MAINTAIN?

I can add and change constraint dates in order-operations with the BAPI but I need to remove the restriction date also ( "Must Start on", " Cannont Start Before", etc).

Manually, I can remove a constraint type by choosing the blank key, but this doesn't seem to work with the BAPI.

Any ideas?

Thanks for any help