Locking LE to timecode
 

I'm trying to lock my 002 system with a timecode originated by a Digibeta and going through a MOTU Micro express. I can see that timecode is been red by Pro Tools, frame rate is correct in both ends but Protools doesn't lock. It keeps jumping and eventually, totally randomly locks to the incoming time code.
Does anybody had or have a similar problem and knows what am I doing wrong?

Thoughts?
Mauricio