To enable this feature, go to Settings > Labs > Association Limits Handling, and toggle it on.
Association Limits
For multi-label associations:
One-to-One (1:1)
One-to-N (where N ≤ 1000)
One-to-Many
Many-to-Many
For contact-to-contact (single label):
One-to-One
Many-to-Many
Custom N-to-N
Preview of association direction + counts when configuring
Error messages shown when the limit is reached
Enforced limits per label, active immediately after saving
Go to Settings > Objects > Contacts
Open the Edit Association modal on a custom object
Select “Single Label” or “Pair of Labels”
Configure relationship type and limit.
Review the preview panel.
Save and test in your object view.
Avoids over-linking between records.
Helps keep data structures clean.
Reduces user confusion when the limits are reached with clear UI feedback.