I am trying to update the roll up summary field(Total Amount) value with minus after stage is change to "Closed lost" in Opportunity.
My scenario is i generated the report using matrix format with stage wise that time total amount is add with "closed lost " also. Total amount is Roll-Up Summary (SUM Opportunity Product) i create the work flow if the opportunity stage is equal to "closed lost" i need the update the Total amount,but i cannot see the field in drop down.
How i update the field if any other way.