Trying to create conditional field for constraint

I have two fields ZZZEligible and ZZZVaccinationDate

I am trying to make a constraint on ZZZVaccinationDate to be required only if ZZZEligible is checked.

Persistent Fields

ZZZVaccinationDate is Date

ZZZEligible is Boolean

Condition field:

Conditions

ZZZCondition
when (not ZZZEligible
or (ZZZEligible
and ZZZVaccinationDate entered))

In the form I am trying to add the fields like

ZZZEligible

ZZZVaccinationDate

constraint (ZZZCondition)

What am i doing wrong here . the constraint doesnt seem to work.

trying to create the condition like

if (ZZZEligible)

return ZZZVaccinationDate entered

else

return true

throws an error not sure why

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An LPL parsing error saving the configuration(s) or you mean the constraint is firing when it shouldn't be? ZZZCondition logic seems ok to me.

both. constraint is not firing.

and also this throws an LPL error ( something about mutable field)

if (ZZZEligible)

return ZZZVaccinationDate entered

else

return true

What is that if/else LPL for or in? I'm not connecting where that comes into place.

Your Condition has to be like this:

ZZZCondition
when (not ZZZEligible
or (ZZZEligible
and ZZZVaccinationDate entered))

constraint (ZZZCondition) says that ZZZCondition must be true or else it will fire the constraint.

i have tried constraint (ZZZCondition) and constraint (not ZZZCondition) . it doesnt trigger in either.

i want it to trigger if ZZZCondition is not valid exactly as you mentioned.