This has been a very knotty problem for a long time.
Way before the prequel movies, West End Games' original Star Wars RP supplements made up huge amounts of info- with no official basis at all- to fill the continuity needed to make a cohesive Galaxy to play in.
Unfortunately, a load of technical and other similar sorucebooks- not releated to the RP- that followed simply took their information from WEG's sourcebooks, assuming that WEG had some sort of offiical information pipeline.
And of course, these sources all started to refer to each other and...
... and eventually we had a total continuity mess based off of some made-up gumf from WEG.
I would be very wary of ever letting that happen again. RPGs are your opportunity to tinker around in your own version of Star Wars. The sourcebooks help you create that. Don't let them trry and actually effect Star Wars continuity as a whole.