How to change inventory posting description in inspection lot?

Hi,

When we record usage decision (qa11), we can make inventory postings in tab 'Inspection lot stock'. There we can see different posting types, e.g. to unrestricted use, to scrap, etc.

Now we want to change the description of these posting types. I tried IMG -> QM -> Quality inspection -> Inspection lot completion -> Define inventory postings. I could only add or delete posting UD, but cannot change its quantity description as that field is in grey.

Is there any place I can modify those description? through img or enhancement or anything else?

Thanks!

Wesley