Similar to this question, I am not shown the related object windows to define what object the record is related to. I have tried manually editing the mappings but it always returns the same "Field mapping invalid" error.

Can someone explain why the screen is not being displayed?

  • 1
    Does the related object have an External ID field? That's a requirement in order for this to work. – sfdcfox May 11 '18 at 16:17
  • It does indeed. – Deployment Failure May 11 '18 at 16:24

So the problem was that the external ID sits in the Person Account object, as soon as I dropped the field into Account the extra screen is shown.

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