I've tried several things that I could think of but with no luck. I'm turning to you good people for some help.

Here in my example I have 2 tables Contacts and Contact Details. Each contact can have many ways to be contacted but I want them to only have one main contact. How can I keep people from having more than one?

I tried to validate by a calculation but no calculation I made would work. If you have any suggestion they are greatly appreciated.

one_main.fp7.zip

Attached is what I came up with using:

- a seperate table for storing the Maincheck

- 2 new table occurences.

- a button to run a script under the checkbox

z_one_main_rev.zip

Thank you very much. That works.

I'm still trying to understand the logic but you found a solution to my problem.

thanks again.

How about something simple?

one_main.fp7.zip

thank you too.

i always find it intesting how different people find a way to resolve the same problem.

I've learned from both of you and that is appreciated.

the cMainCheck = Detail_ID = Contacts::MainDetailID through me for a loop until I realized it was a true/false result. Thanks for that simple sample.

When adding a new record the checkbox will not show as checked until I click outside the portal. Does this happen to anyone else or just me?

The calculation will not evaluate on a non-committed record. Try it this way.

one_main.fp7.zip