Problem with PXE and AutoYast ( SLES10 )

I am using PXEboot with AutoYast ( TFTP and DHCP ) for automatic installation , everything work fine. But i have a big problem, when the server restart for firstboot , PXE work again and the server loop endless install process. I have added some line to autoyast control file as document :

<pxe_localboot config:type="boolean">true</pxe_localboot> 
DEFAULT linux 
LABEL linux 
localboot 0 

But nothing worked, event i have set permission for folder pxelinux.cfg to 777 and check TFTP server worked as well. Why ? And who have other solutions ?