Is it possible to create a new field with the type JunctionIdList?

It would be very useful but it's not available under the field type options in the new field wizard. field types available via UI

In the documentation there's a field type called JunctionIdList. https://developer.salesforce.com/docs/atlas.en-us.api.meta/api/field_types.htm

Is this field type createable?

1 Answer 1


To create a many-to-many relationship, your only option is to create a junction object that looks up to the two objects you wish to relate.

That field type is only available to relate activities to a select few standard objects. See JunctionIdList Fields on Event and Task Objects. Note where it says:

Create many-to-many relationships on the Event or Task object with contacts, leads, or users in the API. For usage details see, Task Usage or Event Usage


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