how to generate report for missing voucher in number sequence...

Hi everyone,

when we create numbersequence it will automatically generate next number like Accno_01,Accno_02,Accno_03,Accno_04.

But in some cases when we create vouchers somtimes it will be miss sequence of number ,for e.g voucher no= Accno_01and next no like Accno_02 but in some cases it will miss the sequence so we need report for missed entry.

how to do this task,can i have logic please

suggest me solution

Thanks in Advance,