Thickness@Sheet-Metal issue in sw 2013

Hello to all,

I just pass to solidworks 2013 and i have a strange issue ( i hope) .

Until now we had a start part that has in custom properties a line with thickness that compile the thickness of the sheet-metal part using "Thickness@Sheet-Metal1".

Now in 2013 i see that the thickness is something like D7@Sheet-Metal(34) and of course is not always the same,making impossible to get the thickness without verifying every sheet-metal part.

Is this a change in sw 2013 or is something wrong with my SW configuration?

Thank you.

SolidworksSheet Metal