We are trying to Upsert data from ECC to SAP PI to Boomi to Salesforce.
Nowhere in the source we are seeing Duplicate data.
However few data are not getting into Salesforce and give us the below error.
OBJ: Product2 - Case SKU Number (US): more than one record found for external id field: [01tj00000033KNPAA2, 01tj0000002xwceAAA]
The field Field1 is a target field and is mapped 1-1 to a source field.
What is the root cause of this error? What is the DUPLICATE_EXTERNAL_ID and how do we fix them? Most importantly does this needs to be fixed in ECC or Boomi or Salesforce.