Hello IFS Community! 

Our opportunities are worked on for an extensive period of time, after being closed won, during which, at times, customers change the initial order. 

As we’ve already booked the initial order against revenue, we cannot just re-open a closed won opportunity and update the initially set estimated base value as that would wipe out the booked value from record.

A potential solution is to copy an opportunity and create an adjusted record of the same for orders that have increased from initial order value but it does not work for opportunities that now have a decrease in value, as the estimated base opp value field will not accept a negative value entered. Anyone else dealing with anything similar to this? Is there a way to enter a negative value in base opp value? 

Thanks in advance!