Oracle Data Integrator 11g

i had a problem with ODI 11g while i was loading some ";" delimited file.

The record is this one:
Header
PIATTAFORMA; FUNZIONE; OPERAZIONE; SUB_OPERAZIONE; DESC_FUNZIONE; SYSTEM; SUBSYSTEM; DES_OPERAZIONE; PROGRESSIVO; TIPOLOGIA; COMMIT; LOGGATA; MOTIVO_ESCLUSIONE
Data
UCAMP-PWS;CDBXF001;;;Inquiry su GEBA;CD;BX;;;Lettura;NO;NO;Funzione senza dati cliente

The field DES_OPERAZIONE is empty for that set of records, but is not a problem cause is a description, my target table is created with all VARCHAR2 except for one field that is Number (PROGRESSIVO in the example) and in this case is empty too, still not a problem cause is not some key or other.

What's happens to me is that if i have the field DES_OPERAZIONE empty, the record will be not loaded but without any message of error or warning. I used the NVL on the field to say if empty then 'ND' but doesn't work. The strange thing is that if i leave empty the field before for example for him doesn't matter, if i use NVL on the field before it works. On teh field DES_OPERAZIONE not !