PO delivery schedule

Hello,

I'd like to adapt in the PO item details delivery schedule (SAPLMEGUI - TC_1320) the displayed fields. If i go there to table settings/administrator/ i can see the current settings. Some fields are marked as invisible. E.G. quantity commited, issued and deliverd.

1. I'd like to display those, but if i uncheck the box, press activate and save - nothing changes.

2. How do i influence quantity commited, issued, and delivered?

Thank you for you help.

Best regards, Paul.