Hi Cordialy,
You mean even though you don't set any criteria in the powl search field "time frame", system still only returns SCs created in the last 90 days?
You may take a look at the document below of how to identify the powl query you use, and check its Query Parameters in transaction powl_query.
http://scn.sap.com/docs/DOC-51966
For example, to set default query search parameters, please:
1, go to transaction powl_query (you should have edit authorization) and display detail for the query.
2, Click 'Query Parameters' and set values for search criteria, i.e. Status, Timeframe.
3, Then accept and save this changes.
4, In order to make this effective for users, please run report POWL_D01 with the following parameters:
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APPLID The corresponding applid
User Portal user(if you want to set this for all users, then set it as '*')
Display Not ticked
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Hope it helps you.
Regards,
Wendy