SW-Mass calculation in equation doesn't work when mass overridden

Hi,

I am using SW2016 SP5.0 on windows 7, hope I am using the write discussion room...

I am trying to present both Kg and Lbs weight for a part in MMGS. I have successfully managed to do that using equations see below

The problem I am having now happens when I override the mass (never-mind why I would want to do that), the equations break and it seems like it cant recognize the file property "SW-Mass" anymore see below:

When I try to add a new global variable with "SW-Mass" it gives me the below error:

Please let me know if you encountered this problem before, any help would be appreciated...

Cheers,

SolidworksDrawings And Detailing