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It has two lookup relationships to Contact standard object as shown below. But in Page Layout I am unable to see the Contact object available in the Related List. I assumed that if you have a lookup relationship in Y object to X object, then X object can be exposed as a Related List to Y object. Am I wrong ?
Since the lookup is from Partner to Contact, you’ll see only fields on the “child” side of the relationship. If you go to Setup > Customize > Contacts > Page Layouts, you can add both related lists (Billing Partners and Business Partners, or whatever you called them) to your contacts’ related list section.
How to change the layout of a related list?
Go to the tab that contains the related list. Click on “Edit Layout” Scroll down to the related list and click on the wrench icon above the related list. That will allow you to edit the fields displayed.
How to add related contact list in Salesforce?
Just follow these steps. From Setup, enter Account Settings in the Quick Find box, then select Account Settings. Select Allow users to relate a contact to multiple accounts. Add the Related Contacts related list to the account page layouts your reps use. From Setup, enter Accounts in the Quick Find box, then select Page Layouts.
There are no Filters, so that is not our culprit. What need to edit the Classic Page Layout, and add the Files Related List. We can check this assignment by clicking on the Assign Page Layouts link in the same Properties. This shows us all Profiles, and the Classic Page Layout assigned to each Profile.
If a Custom Object Related List (via a lookup relationship to another Object with a corresponding Related List) appears in Classic but not Lightning, review the Field Level Security of the Object with the missing Related List.