>OParent has a property pnAmount which I want to read from oChild. I call muGetValue('pnAmount') in oChild. This call is passed through to oParent. The value of pnAmount = 70. This value is returned to oChild, but in oChild I see a value of 24.50.
>Here are some more values:
>oParent oChild
> 70 24.50
> 60 21.00
> 4 1.40
>
>You see the factor is equal in all cases (2.8571). I thought of a hardware problem but the factor is so constant that this is unlikely (I think)

Have you tried doing some normal calculations on the machine, make sure it works?