high "direct path read" in insert

Hi,

We have the following insert:

output tkprof :
--------------------

INSERT INTO FACDIA
( FACDIA_CODIENTI,  FACDIA_FECENVNOV, FACDIA_TIPOIDEN,
  FACDIA_NUMEIDEN,  FACDIA_NOVEENTR,  FACDIA_NOVRESUNO, FACDIA_NOVRESDOS,
  FACDIA_PRIMNOMB,  FACDIA_SEGUNOMB,  FACDIA_PRIMAPEL,  FACDIA_SEGUAPEL,
  FACDIA_TIPIDEDOS, FACDIA_NUMIDEDOS, FACDIA_PRINOMDOS, FACDIA_SEGNOMDOS,
  FACDIA_PRIAPEDOS, FACDIA_SEGAPEDOS, FACDIA_CODENTUNO, FACDIA_CODENTDOS,
  FACDIA_CODENTTRE, FACDIA_FECINVUNO, FACDIA_FECINVDOS, FACDIA_FECINVTRE,
  FACDIA_FECINVCUA, FACDIA_CAMGENUNO, FACDIA_CAMGENDOS, FACDIA_CAMGENTRE,
  FACDIA_CAMGENCUA, FACDIA_CAMGENCIN, FACDIA_CAMGENSEI, FACDIA_CAUSOPUNO,
  FACDIA_CAUSOPDOS, FACDIA_INDIUNO,   FACDIA_INDIDOS,   FACDIA_INDITRES,
  FACDIA_VALOR,     FACDIA_TIPIDEEMP, FACDIA_NUMIDEEMP, FACDIA_RAZOSOCI,
  FACDIA_CODIMAUNO, FACDIA_CODIMADOS, FACDIA_CODTARPEN, FACDIA_FECHLLEG,
  FACDIA_ARCHORIG,  FACDIA_INDIPROC,  FACDIA_USUACREA,  FACDIA_FECHCREA,