One parameter in open-doc url in webi not required

Hi,
 
I am using SAP BO4.0.I have made one open doc URL which links one report to another.While linking there is one extra parameter which have been added, means the linking in the first report is done for a prompt that is not present in the second report.Still, the linking works properly with the correct parameters being passed and I can navigate from one report to another.So I have come to a conclusion that if the prompt is not present in the second report that prompt is ignored in the first report(on which linking to the second report is present). Has anyone come across such a situation.
 
I hope I have made myself clear.