I have created a series of assembly drawings, the drawings contain a BOM table which includes a weight field.  when initially created the correct mass appears.  I then transition the drawing through my PDM workflow.  The next time the file is opened the masses displayed in the BOM table are zeros.  If I open each sub assembly from the BOM table and look at the file properties and then revert to the original drawing containing the BOM table the correct masses are displayed.  However, as soon as I check in the document and reopen the masses are displayed as zeros again.

Any help would be greatly received.