When I add the parameter value to the report heading I have very strange value, if I choose 201402 as input value, un the report heading I see parameter value as 201402,201401.
Somehow previous parameter value gets into the new parameter. When I press refresh without changing parameter I get correct representing of values and parameters in the report heading.
Seems the problem is in that case:
You can define a worksheet to set up many different session
parameters and these parameters will be effective for the duration of the
Discoverer session. However, the users should be made aware of an issue when
this technique is used with Discoverer Plus and Viewer. Web-based Discoverer
caches the results of SQL queries. When a workbook is opened, if the identical
SQL query has already been run then the previous results are returned to the
user. Discoverer does not detect that the context has changed and that the
query will now bring back different results. This issue can usually be fixed by
the user refreshing their workbook.