Description
The default project database is an integral part of an ArcGIS AllSource project and cannot be deleted.
Solution
To use a different database as the project's default database, right-click that database and select the Make Default option.
The default project database is an integral part of an ArcGIS AllSource project and cannot be deleted.
To use a different database as the project's default database, right-click that database and select the Make Default option.