Apart from the rather stupidly worded statement from BASSA I have no idea why it's a problem. However, It seems to be a problem of some significance as it's filled four or five pages of the forum.
In the scheme of this dispute it hardly warrants such prominence. I would think that the problem is a minor one in comparison to all the other troubles for BA.
Outside of this BA (and this forum) there seems to be little concern or opinion one way or the other about the dispute. BASSA have no support in the greater TU movement.