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rohit anand 40rohit anand 40 

Cases

If a case is already open, prevents the status from being changed back to "NEW".
I tried Below;-
ISCHANGED (Status)&&
   ISPICKVAL (Status,"NEW")

But it's not working 
Best Answer chosen by rohit anand 40
PriyaPriya (Salesforce Developers) 
Hey Rohit,

Try this 
 
AND(
  ISCHANGED( Status ),
  NOT(ISPICKVAL(PRIORVALUE( Status ), "New")),
  ISPICKVAL( Status, "New")
)
 

Kindly mark it as the best answer if it works for you.

 

Thanks & Regards,

Priya Ranjan