Hi Kumar,
1) Please go to transaction IE03. Check the master record for Equipment 5642137 from your order. In Organization tab, you will find field Asset. Check if it is blank.
If it is blank, enter the correct Asset number there and save it.
2) Also check if your settlement receiver is of category FXA. if it is FXA, then make sure you have selected correct asset number asa settlement receiver.
Regards,
Amol