Delivery Output Condition table

All,

Can someone please tell how can i add a field to field catalog of Outbound Delivery condition table?

I have already added the field i want to "Field Catalog: output for deliveries" but when i go to "Maintain output condition table for deliveries" that field doesn't show up.

What do i need to do to make sure to add a field to field catalog.

the field i am trying to add is SAP Standard field. its Transportation planning status (TRSTA)

thanks