issues in importing customer contacts and workarounds in Microsoft Dynamics 365 Finance and Operations
While importing customer contacts, it is important that you refer to the party number/ID of the customer master
also seen issue related to specifying 'ContactforParty' field errors even though the field is not exported with data yet D365FO expects it.
As long as you specify 2 of the links ASSOCIATEDPARTYNUMBER & CONTACTFORPARTY
and turn off data entity validation just for import then the import would work like a charm/
Happy D365FO
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