ME22N - Make fields display only.
I have the following requirement I don`t know how to solve so well...
We´ve created a new purchase order type and we need a little special behaviour for it.
At creation (ME21N) all fields must be ready for input, in the same way that the other PO types.
However, in modification (ME22N) we need some fields unavaible for input, just display.
This fields are: Payment Terms (At header level) and Delivery Date (At Position level).
I've trying some user-exits, but I havent found the way to implement this behaviour.
Because of that, I`ve trying to let the fields available for input in ME22N and check values at save, showing a message in case of changes. Could anybody recommend me which user-exit use for this verifications?
Once again, a lot of thanks!