You need to navigate from FODepartment parent object to its child objects, just like you can navigate from the child to the parent using the "parentNav" association.
- SAP SuccessFactors HXM Suite
- OData API
Unfortunately there is no standard way to navigate from the parent object to its child on FODepartment entity.
If you judge this functionality important to the product, feel free to raise an enhancement request on Influence portal - instructions in KBA 2090228 - How to Submit Ideas for SAP SuccessFactors Products.
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