Open referenced documents with read-only access
To work correctly with the PLM integration for SolidWorks, in the System Options - External References dialog box in SolidWorks, the Open referenced documents with read-only access check box must not be selected, as shown in the following picture.
If you select this check box, files opened from PLM for editing purposes may have read-only instead of read-write access.
In SolidWorks, to access this dialog box, select Tools > Options > External Preferences.