Batch Job to invoice sales orders does not work the second time

Hi,

We have setup a batch job to invoice sales orders automatically by the batch based on the selection criteria in the query.

We have setup the batch job with a recurrence of once in a day and the batch job did invoice all the sales orders first time but it does not invoice the second time.

The batch job history shows batch job with status ended but with no work done.

Am I missing something in setup of the batch job.