I have a custom object. When receiving a second line item on that custom object I want a check box field to be updated to true.
I have tried using workflow rule but I couldn't find any relation for the 2nd line item.
Any suggestions? Maybe a trigger but how to lock the 1st line item and fire the trigger when the 2nd line item is in place
I am editing this to give more info. The custom object has a master detail relationship with Contacts. I then created a custom field on contacts(checkbox) where I want this to become true when a second record is on the custom object. I have then created a roll up field that counts that custom object's records and created a workflow rule where rollupfield>1 and the action was a field update of my checkbox to true, BUT still getting unchecked button