When you add a workspace to your site, other objects are included with the workspace. A Document Storage workspace includes four collections in the content portlet; the Team Project workspace provides two collections and one calendar in the content portlet.
If a collection has a custom required property that is not assigned a default property value, you are unable to add either type of workspace. If a calendar has a custom required property that is not assigned a default property value, you are unable to add a Team Project workspace. After trying to add the workspace, the Add a New Workspace page is blank.