An administrator can set the SOLIDWORKS preferences in X-CAD Design Management so that SOLIDWORKS files have mandatory attributes. You cannot check files into the server if they do not contain these mandatory attributes.
For example, if Description is a mandatory attribute and a part does not contain a value for Description, you cannot check it in.
The Missing Mandatory Attributes dialog box appears if you try to check in files with values for the mandatory attributes. The dialog box lists the files that cannot be checked in and the attributes that are missing.