Agent fails. Save report with optional parameter in pdf to file system.

[vovanenok]

Hi all.
I have an agent with only one task: Save report to file system in pdf format.
In Event Studio under my report I see three required parameters: 'StartDate', 'BeginDate' and '@name' (for connection as I understand) and one optional SOURCE_ID (it is used for drilling to this report from another one and filtering detail data and here I want to miss it and get all report data).

So, if I specify in event studio for this report parameters:
Method: use a value (value is default)
I get the following errors:
java.lang.NullPointerException
RSV-DST-0014 An error occurred. See the run history details for more information.

I use Cognos 8.4
Also, when I set to save report to Cognos connection folder - it works fine.

I googled and found there was a such Cognos bug.
Does anyone know workaround for this?