restor name of indd file

Hi,

when I create a pdf sometimes i need to give to the pdf file a different name from the original indd, but if i save the indd file after that it keeps the new name in memory and save with that name evry new pdf.

For example:

File: xxx.indd > yyy.pdf then all the other pdf will have "yyy" name even if the idd files name is xxx. There's a way to restor it? Thank's a lot