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Alexey@YoxelAlexey@Yoxel 

REST API's 'describe' does not report a Task's custom lookup field

Hello,

We added a custom Activity field to our package and started testing REST API access from our demo Org (Professional).
In our Salesforce portal that field is reported and list sproper API name but when we call describe for Task the custom field is not returned.
Also if we try to update the field we get INVALID_FIELD.

In our development Org we could work with the field via API just fine.

Why is this happening in the demo Org where we install our package? Is this a Salesforce bug?

Thank you