Hi
This is weird. This authorization object should stop removing billing block from header, item and overview screen. It is working fine for item and header but in overview its not. I have tested it and searched for some SAP note but couldn't find one. I thought this is SAP bug and there must be some SAP note but I couldn't find one. May be there is some note. You can also try to find one.
We can control this using screen variant or using MV45AFZB USEREXIT_CHECK_VBAP but this is not the satisfactory solution as this must be done in standard system. Now if this is urgent, you can use any one technique from these two otherwise I would suggest you to raise an OSS note to SAP and see what they answers. This should be done after searching SAP notes. May be
Lakshmipathi G could comment on this or provide some note.
Thank$