Trouble with mc control - some help please

I cannot see what´s wrong , perhaps someone could tell me :

Movieclip feltipen1 controls movieclip feltipen2 by means :
_level10.feltipen2.gotoAndPlay(“frame2”);

However feltipen2 does not control feltipen1 :
_level10.feltipen1.gotoAndPlay(“frame15”);

Movie clips and frames have been properly labeled ,
but feltipen2 does not trigger feltipen1 ;
It does not make any sense.
Why ? Any ideas ?
Thank you