I understand now that that is how it works, but if "ro" and "pa" combine with other members of PA differently, then how can they be considered members of the same selma'o?
Another possibility is that of combining definite and indefinite numbers into a single number. This usage implies that the two kinds of numbers have the same value in the given context:
8.18) mi viska le rore gerku I saw the all-of/two dogs. I saw both dogs. 8.19) mi speni so'ici prenu I am-married-to many/three persons. I am married to three persons (which is “many” in the circumstances).(Chapter 18, section 8, at the bottom.)