I'm trying to create a mapping in Informatica that writes a SalesForce lead id into the lead's SFDCLeadId field in Marketo. Informatica reports a successful upsert operation. However the change doesn't appear to get written to the Marketo record. When I examine the SFDCLeadId field after the mapping has finished, it is still empty.
Is Marketo silently rejecting the change or is there something else I'm missing.
Thanks for your suggestions!