[ARSCLIST] Understanding Record Numbers

[D P Ingram <darren@xxxxxxxxx>]

Hello all.

As part of a cataloguing idea I am trying to sketch out some  
schematics.  Could somebody kindly explain/clarify something for me?  
The question refers I am sure to "older" music as well. It just  
happens that I've picked upon a recent(ish) example as it contained  
some other programming issues I have had to work around.

In front of me I have a copy of "You're The One That I Want" by John  
Travolta AND Oliva Newton-John.   It was issued on the RSO Label in  
1978.

Now the question is: The catalogue number given is RSO 006 but  
underneath there is also a number in brackets (2090279). These  
numbers are the same on both sides but don't indicate a date).  Is  
this another catalogue number or what is it ? This gives me the  
problem as I'd like to be able to say "show all records on RSO" and  
this would come up, but what purpose does the other number serve?

Many thanks in advance ! Darren Ingram