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CRM Web API Batch/Bulk operation when upsert is disabled

Hi community,

we're using CRM Web API Batch operation to transfer data from an external system A to client's CRM. To make it as fast as possible we send the maximum 100 records in one HttpPost via CRM Web API. All updates were supposed to be updates, no inserts.

After a few moments we discovered that Web API does an upsert by default so that false GUIDs from System A gets created in CRM. Not good. We added header "If-Match: *" and this fixed our problem, only updates to existing records are allowed. All good thus far.

After few more moments we discovered that not all updates from System A were sent to CRM. Debug logging revealed that all those 100 records HttpPost chunks having a single non-existing GUID were discarded. Not good.

I tried to look how to gain a header set where all valid (99pcs 204's) updates would be accepted and only the non-existent records would be failed (1pc 404). https://docs.microsoft.com/en-us/powerapps/developer/common-data-service/webapi/perform-conditional-operations-using-web-api

Anyone know a way out of this?

BR, Timo

Trying avoid this: The other way is to process the answer and remove the offending GUID away from the original send.

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