it is not possible to use one task twice, for an activity's predecessor. lets say installation of drywall and taping tasks. I want to link taping as

drywall SS + 3 day

which i do, and it is fine

but

taping also can not finish, before drywall can finish. impossible. so, how to show this? MS project doesnt let me to also put a drywall FF as a predecessor to taping

i do not and can not end up with wrong schedule anyway, as my taping can not be complete before drywall is finsih so my dates are ok but as far as showing the relationships i am asking