not IsEmpty ( Child::pkChildID )
Create a value list with just 1 as the only value. Use that as a checkbox.
There is also a way to display a number as a boolean result as a check mark using Wingding but the first option is probably easier for you.
with what kind of trigger i can assign my script,
and if you please elaborate more on Wingding.
Its not a script. You would create a calculation field that check if a related child record exists by using not IsEmpty ( ) on the primary ID which every record should have.
As for the Wingding, with a number, one can format the type as a boolean ( Data formatting section in Inspector ). If one were to use the ü character to show the non zeros and use a Wingding font, you can just put the related child ID directly on the parent layout without using a calculation.
If you dont care about a check and can live with YES or some other text, then you can use the same option as displaying as a boolean ans just use "Yes" instead of the ü.
Sorry for the inconvenience, but I've created a check box with a value list with one value: "Yes", and added to the calculated value section of that field : If(not IsEmpty(PKchild:child); "Yes"; "") , and that didn't work!!!!!, what am I missing here.
You missed my point earlier. If you are going to use "Yes" then just put the related ID field on the parent layout. Then select it and format it as "boolean" under the data tab of the Inspector ( FMP11 ) or in eralier versions, under the format menu --> Number.