Coordinator was not able to receive packet not including dest address, dest panid.

Hi.

I am working with XBee ZB ZigBee RF Module for my Application.
XBee is running IEEE802.15.4TH(2001) firmware, and use XBee Java Library to monitor packet.

XBee was able to receive some packet including Dest PANID and Dest Address in Addressing Fields.
Receive broadcast packets(Dest PANID = 0xFFFF, Dest Address = 0xFFFF), too.

But IEEE802.15.4 standard frame is not necessarily required to set Addressing Fields.

XBee was not able to receive packet NOT including Dest PANID and Dest Address.

I think I am missing some basic setting or something here. Really appreciate any inputs on this.