The following error occures by adding a Window-user in Dynamics NAV.
15138, "42000" The database principal owns a schema object in the database and can not be deleted.
Last weekend we executed all server-updates!
find out which schema object the user that is being deleted owns.
It could be the owner of the db and you have to change the owner to sa.
Can you please look into this : :blog.sqlauthority.com/.../sql-server-fix-error-15138-the-database-principal-owns-a-schema-in-the-database-and-cannot-be-dropped
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