Bill. order for inst. 16830 sch.bill.date 01.02.2010 bill.proc. 01 not in selection

Hello All,

While creating the billing documents with the below inputs I am getting the error that :

Bill. order for inst. 16830 sch.bill.date 01.02.2010 bill.proc. 01 not in selection

I have created the Meter Reading Order and entered the meter reading. Don't know why this error is coming. Could you please help me on the same.

Bellow are the details of the screen shot: