Did you go though the check out process when you had the pre-orders in your basket? You have to do that to complete the pre-order process. Once you do that they sit in a sort of back-order state the idea being they will email you when they have them and you have to pay.
Then if you go buy something else the only thing in your basket will be the new item (i.e. the cable) as the other items are sitting in this pre-order queue. If however you added the pre-orders into your basket but didn't check out they probably are not actually pre-ordered if that makes sense?
You may still get away with it if you check out and then after buy the cable...
Of course if i got the above wrong in your instance Sun then forgive me, but its the only scenario that makes sense to me as I've got some pre-order items ordered and i've bought stuff since
Then if you go buy something else the only thing in your basket will be the new item (i.e. the cable) as the other items are sitting in this pre-order queue. If however you added the pre-orders into your basket but didn't check out they probably are not actually pre-ordered if that makes sense?
You may still get away with it if you check out and then after buy the cable...
Of course if i got the above wrong in your instance Sun then forgive me, but its the only scenario that makes sense to me as I've got some pre-order items ordered and i've bought stuff since
Happily collecting things all my life... 