PERFECT! Now the dumper print:

################# Stampa dati FUORI SUBROUTINE ###############


$VAR1 = {
          '6' => {
                   'next' => [
                               'AO'
                             ],
                   'fields' => [
                                 'AA,8,U,DE',
                                 'AB,8,U,I',
                                 'AC,14,U,I',
                                 'AD,8,U,DE',
                                 'AE,8,U,DE',
                                 'AF,8,A,DE',
                                 'AG,8,U,DE',
                                 'AH,7,U,I',
                                 'AI,8,U,DE',
                                 'AJ,7,U,I',
                                 'AK,5,A,DE',
                                 'AL,10,A,I',
                                 'AM,2,A,DE',
                                 'AN,14,U,I'
                               ]
                 },
          '5' => {
                   'next' => [
                               'AQ'
                             ],
                   'fields' => [
                                 'AA,8,U,DE',
                                 'AB,8,U,I',
                                 'AC,14,U,I',
                                 'AD,8,U,DE',
                                 'AE,8,U,DE',
                                 'AF,8,A,DE',
                                 'AG,8,U,DE',
                                 'AH,7,U,I',
                                 'AI,8,U,DE',
                                 'AJ,7,U,I',
                                 'AK,5,A,DE',
                                 'AL,10,A,I',
                                 'AM,2,A,DE',
                                 'AN,20,U,I',
                                 'AO,20,A,DE,NU',
                                 'AP,10,U,MU'
                               ]
                 }
        };

Il primo campo disponibile del file 905 sul Database 5 e': AQ

Il primo campo disponibile del file 905 sul Database 6 e': AO
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