Not able to mass delete

[kinsbrunner]

Hi all,
I am trying to implement an OData Service for a custom business object I have created. There is a functional requirement where we will be receiving batch inserts and the expectation is to be able to mass delete the existing data when we receive a POST. (This would be something similar to the OVERWRITING functionality offered by Cloud Data Source web services but, as it is based on SOAP, SAP will deprecate it by 2020).
In case there is no way of overwriting the records, is there a was to make a mass delete without needing to send any ID? Just delete everything....
Cheers.
Alejandro.