Write to Data Store entity Error

Hi there,

I am getting this error while writing data to data store entity.

An error occurred while trying to write to the data store [IPA Main DS]. No values have been written. Details: org.hibernate.id.IdentifierGenerationException: ids for this class must be manually assigned before calling save(): IPAIRRIntegrationLogDT11401 (APNX-1-4208-004)

Thanks