The differential base attribute for file '%1!s!' of database '%2!s!' has been reset because the file has been restored from ...

The differential base attribute for file '%1!s!' of database '%2!s!' has been reset because the file has been restored from a backup taken on a conflicting recovery path. The restore was allowed because the file was read-only and was consistent with the current status of the database. Any future differential backup of this file will require a new differential base.