I'm using Dataloader to Upsert a Child Account to Parent Account using an external ID.
When the Upsert is complete, the Child overwrites the parent, it's not not connecting the Child Account to the Parent Account.
((See Answer Below))
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Sign up to join this communityI'm using Dataloader to Upsert a Child Account to Parent Account using an external ID.
When the Upsert is complete, the Child overwrites the parent, it's not not connecting the Child Account to the Parent Account.
((See Answer Below))
You should only be selecting your External Id field in Step 2b. You don't want to match the child records to the parent records and update them; you want to connect their lookup relationship.
Step 1 is identifying existing copies of this record in your database.
ParentId
only.
– David Reed♦
Mar 9 '20 at 18:13