Use
In certain cases, you may wish to change scores.
For example, suppose a vendor has missed delivery dates because of a lengthy strike. This results in the vendor achieving a very poor score for the automatic subcriterion "On-Time Delivery Performance". If you do not want this exceptional situation to make a significant difference to the vendor's score, you can overwrite the score with a better one.
Prerequisite
Before you can change a score for a subcriterion, the field must be ready to accept input and you must be authorized to make changes.

Authorizations and field attributes are maintained in Customizing.