1-Not WF errors.
2-WF have a state machine and in the first branch have a "Log to History List = Nota enviada" action.
3-After, start a second branch with a "Wait for Field Change in Current Item" action, when item change a "SI" value.
4-WF not contiune to 3rd branch although the column in item specific change to "SI", why????????
5-This situation is aleatory, if stop this WF and restar this WF work correctly.