You need to know if it's possible to query deleted records from SF entities using OData API.
- SAP SuccessFactors HXM Suite
- OData API
OData API has no functionality of fetching the deleted records from EC or MDF objects or information which is not available on SuccessFactors UI.
One alternative would be using Compound Employee API, which retrieves the audit of the data being queried, returning the records that were deleted too. Refer to KBA 2860563 - Retrieve MDF deleted records using API in SuccessFactors HXM Suite
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