I was about to make an A/R invoice (Copy from unclosed Delivery form) for some transactions from Open Items List. I tried to make some amendments (e.g. Tax, Description) but the fields are disabled. But I can edit some other transactions from Open Items List. I just encountered this in SAP version 8.8 (previously I used SAP 2005A and I had no such problem).
I have similar problem with A/P Invoice as well.
Why this happens? Is there any way to solve the problem (I need to edit the Tax field to make tax report)?
I prefer not cancelling Sales Order/ Delivery Report, because there are many transactions to do. Redoing means spending quite a lot of time and effort.
Thank you in advance for all answers.