Subscription Contains Invalid Parameters In RS2000

Occasionally I have this error happening in some of my subscriptions: Subscription contains invalid parameters.

What is actually happenign, one of the parameters has lost the value on which it was previously running without problems. If I open subscription the first parameter, of more, is having no value. The value that is usually lost is first option in drop down list, being for ALL of bellow values. When the error happens it has no value, and that option normally doesn't exists as a parameter value. (If you go creating new subscription that same parameter doesn't have empty values as options to be selected. I usually return ALL and then other individual values.)


For example, one report is having paramteres that returns values from the stored procedure, and the return dataset would be:


Value Label
----------------- -----
'SP1','SP2','SP3' ALL
'SP1' SP1
'SP2' SP2
'SP3' SP3

So, when the error happens, in no reason (no changes to proc, to report design, to subscription,...)
usually those subscriptions that had ALL for this parameter have lost the value, the option is BLANK, and is treated as invalid value, which is correct, as my query also doesn't return BLANK value.
I have to manually go into subscription and set up the value back to ALL and then it's OK, untill next time.

Has anyone experienced this problem?

Does anyone now the fix for this? We thought that hot fix on SP2 may solve this, we applied on dev server but it didn't.

Or maybe someone knows workaround this issue?

Thanking in advance!

Regards,
Elizabeta