Hi,
You can validate the corresponding field in the validate embed and test for the required value.
If the value is not up to your wishes, Put your error message in Loc:alert and put the name of teh field in loc:invalid and cycle.
example : In de validate embed type the following:
if tickbox <> 1
loc:alert = 'Field is invalid. Box must be ticked.
loc:invalid = 'tickbox'
end
I don't know if you must cycle here.
Just try.
Rene