Originally Posted by
rj123456
Union Bank Rewards keeps giving me a reference beginning with LJ....
The BA number begins with 2W.
I wouldn't read much into it - the BA number is what you need for doing stuff with BA I'd have thought. The different reference numbers could well be just based on your booking being made in something other than Amadeus (BA's GDS) and so it got copied and a shadow PNR made for BA's purposes.