when we post item journal, xml file should be auto generated

Hi
when we post item journal, xml file should be auto generated ,

path will be given in given in general ledger setup

i have created a xml port and assigned it to the post buton the xml file is generated automatically.

Now the problem is the file is saving in the given folder but the actually thing the path will be given in the general ledger now by posting item journal the file should be saved in the given ptath of general journal.Please help me about this.

Thanks in Advance