Thank you Peter for the answer.
At the moment I have created a new db copying the FDT of the old database and managed the import of the ISO file. I am fine-tuning all the component of the new db (FST and PFT), finding actually some errors in field searching (e.g I search a word in field A, but the system give me results also if the word is in another field).
Thank you again. Best regards
Francesco
ABCD Global