Querying on Customfield using Tooling API in workbench is returning relationship label "null" even if object has the relationship field(lookup/master-detail). For Example: My Object has 3 relationship field. User (Lookup) Contact (Lookup) custom object (Master-Detail)
but on querying customfield relationshiplabel on rest explorer I am getting null for relationship label.
same result from developer console as well, here's my query.
I also tried to query RelationshipName instead of RelationshipLabel but it returned INVALID FIELD but it is mentioned in the document that we can use it here's the link: https://developer.salesforce.com/docs/atlas.en-us.api_tooling.meta/api_tooling/tooling_api_objects_customfield.htm
Does this field contain the correct data?