Activity › Forums › Salesforce® Discussions › Can we have duplicates in the External ID in salesforce? Salesforce® Discussions Can we have duplicates in the External ID in salesforce? Posted by Anjali on August 19, 2020 at 7:43 AM Can we have duplicates in the External ID in salesforce? MOHIT replied 5 years, 9 months ago 2 Members · 1 Reply 1 Reply MOHIT Member August 19, 2020 at 7:44 AM NO. Log In to reply. Public All Members My Connections Only Me PublicAll MembersMy ConnectionsOnly Me Public All Members My Connections Only Me