CDS OData Web APIs UpsertMultiple can not update records when entityCollection includes both update record and create record.

[jitliu]

The issue was logged as bug in Azure devops, and it was fixed. We hope we can get the uptake here. Details was sent via Email.

[MattB-msft]

This is an undocumented API and is not yet fully supported by the server platform.
When the server fully supports it, the current CdsServiceClient will be able to access it.