Track logging purchase problem

Hi,

I have trouble purchasing track logging in-app. I've successfully downloaded the premium maps but I can not purchase the track logging it is not alive on my iphone (I cannot purchase track logging through the app if I click the red trolley button nothing happens and the orange button is paled out). I've been advised I need to not restrict in-app purchasing in iphone settings, I've disabled all the restrictions but make no different.I'm desperately looking for more help.

Many thanks
Sophie