Change unit menu

[chris h]

From an early thread I thought you could change anything to anything if you hade enough points and the new unit is available by date. This does not seem to be the case or, and more likely, I'm doing something wrong.

This is a bit long and hopefully not too confusing.

I created a Kraftrad Zug with 3 x Kraftrad, 1 x Kradschutzen Sw and 1 x 3xBewagenKrad to carry the later. My idea was that I would convert it a Schutzen Zug minus the transport as the war progressed. (both are shown in the pic).

I can change the Kraftrad to Schutzen but cannot change the Sw unit or the Bewagen to a 5cm leGrw or PzB 39 respectively.

Is this because the Grw and PzB 39 are units while the other two are formations?

Help need please.