Automate File Based Data Import using ErpIntegrationService

A lot of customers are past the point of adapting Oracle Cloud Applications and are moving to the next step of the lifecycle, being integrating Oracle Cloud Applications within their enterprise architecture. Oracle is currently providing a plethora of CRUD web services, REST and SOAP for integration.
But in some cases the only ability to interface data is still through File Based Data Imports (FBDI).

Nullify fields using Oracle Cloud HCM web services

Recently I got a question from an Oracle HCM Cloud customer, which is using SOAP services to interface HCM data. The question was: How do I clear field data using web services?
Using HCM Data Loader you specify the value #NULL to explicitly pass a null value to a field, also this is used throughout ERP services, however the WorkerService did not respond like that.