Update field on form after values of other input fields have changed

[Jan_van_Ansem]

Hi VC guru's

I have a what I thought very simple requirement.

I have a form where the end user can put in two variables.

A third field contains a formula based on these two variables.

I would like this field to update automatically either (preferabely) each time one of the input field changes or alternatively when I hit the submit button.

It does not happen automatically ;(

I thought maybe I need to declare an action but couldn't work out how that would work.

Many thanks in advance,

Jan

[Jan_van_Ansem]

Ah... it was all down to using the right formulas. Although the formulas were "error free" my colleague pointed out that they actually didn't work. Once the formulas were right the field updated automatically.

Jan