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Som_11Som_11 

Not able to add new forecast type, Getting below error:

Not able to add new forecast type, Getting below error: Opprtunity revenuw by defalut coming whrn trying to add Opportunity Quantity getting below error. I am using developer edition. Can anyone help me with this.User-added image
VinayVinay (Salesforce Developers) 
Hi Somesh,

Check below reference for 'unknown duplicates value on record with id' error on forecast type.

https://salesforceoke.blogspot.com/2019/03/salesforce-upsert-duplicate-value-found.html
https://www.simplysfdc.com/2014/02/salesforce-revenue-forecast-error.html

Thanks,