how to prevent upgrades

[shane56]

if I want to use specifically a flamm II panzer in a new support unit I've set up and do not want it to be upgraded to a marder how do I tell the game not to do this ? which is what is happening to my zbv pz bat. I want it to have a flam II panzer not a marder. If it cannot happen is there a work around for this?
thanks ..shane

[Iron Duke]

You could create a new entry in ground elements - with no upgrade path , i would then add factory to produce it , possibly adjusting the number of factories producing the original Flamm Pz .