How do I upsert data with dataloader to a custom object?

I have one Lookup field ("Class id") in the record that course trubble: I get following error notifications: "Class id: id value of incorrect type: B99"

What do I have to do to be able to fill this field?


It seems like you are passing the wrong value. Salesforce ID can be only 15 or 18 chars but you are passing only 3 chars, you should map data correctly from your csv while using dataloader.

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