InfoPackage - Delta Update

Hi,

I noticed something strange. I created an InfoPackage in Dev with delta update and promoted to Q and P, but I don't see the radio button 'delta' in Q or P at all. Is it common? I could not find any thread on this in the forums.

Another issue is I am trying to create a delta infopack for 0Customer and 0Material master data load, but I don't see that option in D. Please comment.