Removing Related Modules Lookup Fields Assignment / Relationship

Removing Related Modules Lookup Fields Assignment / Relationship

Issue:  When creating a related list, I accidently selected module itself creating a circle reference. See attached.

Situation: I wish to relating a custom module called "Phone Calls" to Leads and Contacts.

Outcome: 1) I either want to remove the this relationship or delete the custom module and start again. There are no options in either the UI or API interface to remove this relationship.

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