When is it required to populate a value for Performance Satisfaction Plan In a Source Document Type?

Which two are choices for the Satisfaction Method when defining a Performance Obligation Identification Rule?

A corporation wants to use any potential values In a segment of their Pricing Dimension Structure, as long as those values do not exceed a length of 50 characters.
Which validation type must be selected when defining this Value Set?

What is a Performance Obligation?

Your customer ships machines, and can recognize revenue for each machine after the machine has been delivered to a customer without waiting for complete satisfaction of an entire performance obligation. How would you configure Satisfaction Method (SM) and Satisfaction Measurement Model (SMM) in Revenue Management to recognize revenue for these performance obligations at a point in time?