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ARUN JOYARUN JOY 

Not able to write a formula ( Row level formula) in SF Lightning reports

Im trying to build a report  on lead object  where I have to show the a report where maximum lead happened from specific 6 digit postal code location . So I need to to remove last 3 digits of postal code and show first 3 digits of postal code on the report , group it and display it in charts . I tried to write a formula ( by adding a row level formula) but not able to validate the formula .

Formula i wrote is 
LEFT(Zip/Postal Code,LEN(Zip/Postal Code)-3)
But validation is failing ?
Can someone guide me on this.
VinayVinay (Salesforce Developers) 
Can you try below?
LEFT(Zip/Postal Code,3)

What is the error message which you get?

Thanks,