Hi Judith,
Maybe when you get a reply it will be clearer than I will try to explain

I just phoned Vic BDM and was told that in the case on this thread,
Campbell/Hughan/Butler, It would be indexed 3 times because the mother
used 3 different surnames on the registration. In this case the "R" = multiple entries.
Where there is a registration number, eg 1234 and another 1234R, this would indicate
that there is an error either in the reading of the actual registration or a
error when entering the information from the registration. They had no provision
to amend an entry once it had been keyed in so the alteration was coded with the "R"
Is that as clear as mud???

Raylen