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leluttrellleluttrell 

How can I lock the close date once an opportunity hits a certain stage?

Once an opp enters one of three stages, I want the close date to lock. Does anyone have an idea on how to do this?

 For example:

If an opportunity's stage = Awarded - Written, Awarded - Signed, or Awarded - LOI, I do not want the close date to be editable. 
Best Answer chosen by leluttrell
SalesFORCE_enFORCErSalesFORCE_enFORCEr
You can write a validation rule which will fire when Stage is Awarded - Written, Awarded - Signed, or Awarded - LOI and CloseDate is changed. Something like this:
AND(OR(ISPICKVAL(StageName,'Awarded - Written'),ISPICKVAL(StageName,'Awarded - Signed'),ISPICKVAL(StageName,'Awarded - LOI')),ISCHANGED(CloseDate))