Child relationship name for Related List for Custom Object

Question

I created a custom page that I want to show the related list between my Opportunity Object, and a Custom Object (DocuSign)

I have not been able to insert the proper relationship name, and I get the error:

'XXXXX' is not a valid child relationship name for entity Opportunity

I went into the Custom Object, click on the field that is related to the opportunity, and on the Child Relationship name I found this:

This kind of looks like an Id.

My code looks like this:

<apex:relatedList list="R00N80000002fD9vEAE" title="Opportunity DocuSign Status">
        <apex:facet name="header">Opportunity DocuSign Status</apex:facet>
      </apex:relatedList>

I have tried adding __r at the end of the field Id/name, but still no luck.

Answer 1

You can get the fully qualified API Name of the Child Relationship (including any namepace if applicable) using the following script:

for (ChildRelationship relation : SObjectType.Opportunity.getChildRelationships())
    system.debug(relation);

Filter the results to look for your specific child object. Likely it has a namespace prefix which you were missing.