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Currently, we can not able to perform Odata multi expand. Only first-level expansion is supported. It would be wise and relevant to add this query option.
STATUS DETAILS
Needs Votes

Sunil Garg (administrator) on 2/18/2020 4:01:34 PM
Thank you for your feedback.
Currently this is not in our roadmap; however, we are tracking it and if we get more feedback and votes, we may consider it in the future.
Sincerely,
Sunil Garg