Is it fair that they were promoted without a degree and are now held back because they changed the rules on them?
It is my experience and belief that UPS put that qualifier in place close to 20 years ago.
They have made it known loud and clear since then that if you do not have a degree, get one if you want to be promoted.
Rules get changed every day.
Most management is expected to keep their degree "current" and "viable".
That means lots of reading, classes and certification - all on one's on time.
UPS "discovered" it was a lot cheaper to hire people with the skills than to educate them - probably in the early 90's.
Prior to that UPS was known for internal on-going continuing education.
That is practically non-existent now except for legal risk-management training.