not sure why is hurting you but try this:
at simplest: trading a vet who signed a contract with a lot of bonus $ can be cap suicide for the losing team because all that bonus $ that was being prorated over the out-years of the contract - all of a sudden gets lumped back into the here and now in one lump sum.
if player is in last year of a contract it will make no difference;
if he still has 3+ to go; a trade is unlikely.
Ex:
2010: player A: signs 5-year deal for $25M -$1M salary per yr & $20M signing bonus (sb)
cap hit on team each yr: $5M
cap hit in yr traded to losing team:
-if traded in 2011: $16M
(20sb - 4M from 2010) [team out cash of $21M for 1 yr of play]
-if traded in 2012: $12M
(20sb-8 from 2010-11) [team out cash of #22M for 2 yr of play-11M per]
-if traded in 2013: $8M
(etc) [team out $23M for 3 yrs-7.6 per]
-if traded in 2014: $4M
(etc) [team out $24M for 4 yrs-6M per]
obviously trading the guy in 11 or 12 makes no sense; it dumps 10%+ of your cap space on a guy who is going to play for someone else. unless the guy is screwing the coach's wife
; a team wont do that.