I have been able to use the "Save Data" button in the "Data Input" section of the S&OP Excel Add-In ribbon on other instances, but I can't seem to get the "Save Data" button to work on this instance that I am currently using. I made sure that edits are allowed for the field from the S&OP web UI:
I am using the default "SOPADMIN" user. Are there special privileges that are required to edit data?