Cause: If account assignment e.g. for cost center is changeable in the Invoice, then posting to cost object can be different from that done during goods receipt. This will cause inconsistency in the system.
One must do a configuration setting in order to bring control over the accounting documents
IMG / Materials Management / Purchasing / Account Assignment / Maintain Account Assignment Categories
You will get the below screen
There is lot of account assignment category, one must need to verify according to the scenario of the customer. Here, I have taken example of a cost center “K” . Double click the line item, you will be followed by below screen shot.
Now uncheck “ AA chgable at IR” and save the configuration setting,
User now will not be able to edit account assignment in Invoice receipt. This is very useful and also was noticed in one of our clients and I made the required changes.