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validate field entry by value list

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I have two fields that are filled in from a drop down list. Once the user selects from the first drop down, the next field needs to be populated from a drop down with the "child list" of the first field. If the first field is changed, then the second field must have values from the related "child list"


first field drop down list is:



second field drop down list is based on the first field choice as follows:

If first field north, drop down shows



if first field south, drop down shows



I have this working except for a validation on the second field. I need to validate that the second field is populated with only one of the values from the related drop down. So that if a person selects south, and then 2d, they can't later go back and select north, but leave 2d in the second field. The system will error out and say "you need to select from the list provided (which would now be 1a, 1b). Hope this makes sense.

I have tried to put a validation on the ddr2 field but it isn't working quite as I expected. I have provided a db for review.

Thanks so much for any feedback.



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Validation by "Member of value list" triggers on field exit - therefore modifying another field, and the contents of the value list as a result, will not cause Filemaker to re-examine all fields that use the value list.

Use a validation by calculation instead:

not IsEmpty ( FilterValues ( drop down 2 ; ValueListItems ( Get ( FileName ) ; "dd2" ) ) )

and uncheck the "Validate only if field has been modified" option. This will trigger on committing the record.

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