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krishnak2krishnak2 

Upsert will not Update existing record if a mapped (non-required) lookup field is null

Trying to upsert an Account record with the field " Parent", lookup field, mapped to an external Id on Account. It works fine when there is a valid value. If the value is blank, it throws an error sayin"INVALID_FIELD, No fields provided in an external foreign key reference in entity: Account". It works fine when I used Dataloader. The issue is with CastIron and Soap UI.
Pradeep Kumar L.GPradeep Kumar L.G
Hey Krishan,

Did you find the answers to this issue,.
Thanks
Pradeep