Variable values being reset to # / 00.0000

Hi
I have a problem with our web template, although the same thing happens on the SAP default template.
Run a template, and you are shown the variable selection screen. For this particular query, there are 2 variables, namely SITE and FISCAL PERIOD/YEAR.
I leave the values blank, and run the report.
The report comes back with data. There is only data for site B01 and period 005.2008, but as I left the selection screen values empty, it tried to return all data.
If I look at the report information, I see that there are no dynamic filters applied, as expected based on the values I used on the selection screen.
If I now try to broadcast the report via email, the report refreshes, and shows No Data Available. If I now look at the report information, I see that there are 2 dynamic filters applied. Site has been set to #, and period has been set to 00.0000. There is no data for those values, hence No Data Available is shown.
If I run the report and enter B01 / 005.2008 in my variable selection screen, I get the same report data coming back, and I am able to broadcast via email.
The problem seems to be that if the values are left blank, when I choose to broadcast they are then reset to # (or 00.0000 for period), and I don't know why this is.
Please let me know if there is a decent solution out there?
We are on NW2004s SP16.
Cheers,
Andrew

Thanks for the prompt reply, but your answer has little to do with my question.
I am running a report, and trying to email it. There is nothing about setting up a schedule. The error comes in as soon as I try to email the report.
The error is that if I leave the variables empty in the variable selection screen, they are overwritten with what SAP seems to think are default values, and in this case those default values are horribly wrong.
Cheers,
Andrew

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