Hi Ria Sen,
Please follow the steps as below,
1. Use Select single Max Query to select the latest maximum number
2. Check <variable> is initial or not.
3.if variable is initial assign the number which will start from your number range.
4.else increment the variable values by 1 and update the new range values.
Ex: Select Single Max ( Field for Number) from <table>
into <variable>.
if <variable> is initial .
<variable> = 'Starting number from your range'.
else.
<variable> = <variable> + 1.
Please let me know if you have any issues.
Regards,
Gurunath Kumar D