4.4 To preserve right When the prescription nearly
expires, Mr. A paid a part of money to Mr. B (say 1,000 baht
out of 50,000 baht). So the prescription is extending to
another 10 years from the date that Mr. A paid a part of
money.
This means Mr. B preserves his right to get repayment to
another 10 years.
4.5 To Extinguish right e.g release.