I'm trying to add 2 Z fields to MM17 transaction and I already read sap notes related to this issue, but only 1 of my fields is editable on screen while the other one is only visible, I also checked the tutorial http://stankowski.it/webpage/how2/A001.pdf that is mention in other questions and also check this https://archive.sap.com/kmuuid2/503750b6-0a57-2e10-489f-acfb68ae7e54/Enabling%20Mass%20Maintenance%20of%20Append%20Fields%20of%20Material%20Master%20Tables.pdf , but I don't know what else to check and why only one of the field is working.
I leave the attachments of the configuration.
Regards
Nicolas Caro