Service Desk Manager 14.1, 17.x
There is an out of the box "Service Desk Administrator" Pre-Update Data Partition on the SKELETONS table which restricts access to create or modify knowledge documents.
1) Check the contact record of the user to see if they have "Service Desk Administrator" as the set data partition.
2) If so, then navigate to Administration tab -> Security and Role Management -> Data Partitions -> Data Partition List -> Service Desk Administrator
3) The constraint that we need to inactivate is "Pre-Update / Skeleton table / id = 0"
4) After you inactivate this, sign out then sign back in and you should now be able to rework and create knowledge documents.