Hi I need some help with a calculation

[johnrh]

Hi everyone

I need some help with a calculation.Here is a very simple example. I have 3 fields A, B and C

Field A is a calculated field - simply Field B x Field C. Both B and C are Number fields.

Until B & C are filled in A is empty obviously.

I need the user to be able to accept the value in C as a calculation or to simply change the value in field C by typing a number directly into field C.

At the moment I cant enter data directly into a calculated field.

Does anyone know a way around this.

Many thanks