Please support/implement the „upsert“ functionality for the OData service endpoint. (According http://docs.oasis-open.org/odata/odata/v4.0/errata02/os/complete/part1-protocol/odata-v4.0-errata02-os-part1-protocol-complete.html “11.4.4 Upsert an Entity”)

Without this feature, an OData client has to perform a GET request first, to check if the record already exists or not. Than perform a POST or PATCH/PUT. Currently, unnecessarily many requests are needed.