https://launchpad.support.sap.com/#/notes/2668887
https://help.sap.com/docs/SAP_SUCCESSFACTORS_PLATFORM/d599f15995d348a1b45ba5603e2aba9b/505856f7d9814f76a8894ec4f0d9e16e.html
# To fetch the entire metadata of an instance
https://<hostname>.successfactors.com/odata/v2/?$metadata
# Fetch the metadata of specific entity
https://<hostname>.successfactors.com/odata/v2/PerPersonRelationship/$metadata
# Fetch metata of specific entity including navigation properties
https://<hostname>.successfactors.com/odata/v2/Entity('PerPersonRelationship')/?$metadata