https://community.squareup.com/t5/Archived-Discussions-Read-Only/quot-This-ID-has-already-been-used-quot-error-message/m-p/20367#M86708 <P><a href="https://community.squareup.com/t5/user/viewprofilepage/user-id/28819">@TribecaCitizen</a> - So sorry for the delay in following up! Were you customizing the "Invoice ID" field when you were creating it? It sounds like this number may have already matched an outstanding/previous invoice.&nbsp;</P> Thu, 06 Oct 2016 23:48:18 GMT Sean 2016-10-06T23:48:18Z https://community.squareup.com/t5/Archived-Discussions-Read-Only/quot-This-ID-has-already-been-used-quot-error-message/m-p/16625#M86707 <P>I keep getting an error message saying "This ID has already been used" when I try to send an invoice. No clue what that even means.</P> Sun, 04 Sep 2016 16:32:11 GMT https://community.squareup.com/t5/Archived-Discussions-Read-Only/quot-This-ID-has-already-been-used-quot-error-message/m-p/16625#M86707 TribecaCitizen 2016-09-04T16:32:11Z https://community.squareup.com/t5/Archived-Discussions-Read-Only/quot-This-ID-has-already-been-used-quot-error-message/m-p/20367#M86708 <P><a href="https://community.squareup.com/t5/user/viewprofilepage/user-id/28819">@TribecaCitizen</a> - So sorry for the delay in following up! Were you customizing the "Invoice ID" field when you were creating it? It sounds like this number may have already matched an outstanding/previous invoice.&nbsp;</P> Thu, 06 Oct 2016 23:48:18 GMT https://community.squareup.com/t5/Archived-Discussions-Read-Only/quot-This-ID-has-already-been-used-quot-error-message/m-p/20367#M86708 Sean 2016-10-06T23:48:18Z