Hi David and thanx.
I must correct myself. Acutally it's not the 2 tokens synonym to create the error but the diacritic.
the original row was:
abbattere, ammainare, peggiorare, tirare giù => this causes the malformed error because of the ù
If ireplace ù with u' it works!
abbattere, ammainare, peggiorare, tirare giu' => OK
Therefore i think i'm going to replace all the diacritics
Thanx valerio