Excel function value() not working for attribute value

Hi,

I'm trying to create a local formula in an added query column. It's supposed to multiply columns E and H.

Column E is a custom attribute of 0Material storing the price per litre.

The idea was to have a function like this:   =value(E2) * H2

Unfortunately Analysis doesn't like that and always returns 'NA'. Same result for just a simple 'value(E2)'.

Is it in general possible what I'd like to achieve or am I simply doing something wrong?

Thanks

Stephan