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Sarah KalmbachSarah Kalmbach 

Salesforce error: ID in upsert is not valid

I have a button that creates a Formstack survey, allows a client to fill out information, then writeback to salesforce and updates fields. This has all worked very smooth until a few weeks ago when I started receiving this error:

There was an error creating Opportunity 1. Salesforce error: Id in upsert is not valid

I'm assuming this is in relation to the Opportunity ID but I have no idea how to fix this! Help!

The code for the buttom is as follows: 

https://'company name'.formstack.com/forms/'formname'_scoping_v50 
ShashankShashank (Salesforce Developers) 
You may have to reach out to formstack support for this: https://support.formstack.com/