Not able to edit Sales Invoice Batch job parameters....?

Hi All,

I have scheduled a Sales Invoice batch job using AR --> Periodics --> Sales Update --> Invoice.

The Batch job runs on week days (Mon - Fri). I have been using this batch job since 2 months. I created this batch job

on Monday and I submitted the job, then the problem is if I wish to change the parameters for the same batch job on next

Monday , the Parameters form (SalesEditLine(Form)) is non editable, means I am not able to edit any of the controls.I did

the debugging all the ways but no use.

Thanks in Advance...!