Global thickness over riding part thickness

Hi,

A few others have posted similar questions but the answers dont fit in this case.

The attached part (SW13) is 32mm thick but when put into a BOM, shows 10mm thickness bcause of the 'global thickness' setting.

How can I change the global thickness setting or can the BOM get the thickness from somewhere else?

I have a custom property in the part template "Thickness@FH11RTa.SLDPRT".

Thanks in advance,

Fraser

SolidworksSheet Metal