How to get "Thickness@Sheet-Metal1" on SW2013 and up ?

Hello,

up to SW2013 it was easy to create a custom property of the thickness of sheet metal part by entering "Thickness@Sheet-Metal1". However, on newer versions (I am on SW 2014) this is not working anymore. I have found a few threads in this forum and elsewhere trying to find a solution, but they all ended up at dead end. Can anything be done to access this thickness? Maybe it is possible to access it as value of an object, by creating a macro script - to write a final value of the thickness to the custom property?

Thank you for the ideas

SolidworksSheet Metal