Hi,
On the submit options dialog I have 'allow users to submit this form' and 'perform custom action rules' selected.

Then in the rules dialog, I have my rule to set the form-field value above my rule to submit the form.

This rule to set the value of the form-field is 'set a field's value: formSubmitted = "yis"
Condition: None - This rule always applies

When I submit my form without filling in all the fields it shows the default 'cannot submit because it contains validation errors' message - this is fine...

But the value of formSubmitted is not updated...

Hopefully these pictures will indicate something really simple that I'm doing wrong!
Thanks
Miowmix2