Hi Johan,
Since the MaxPS is a field in the table (At ArcGIS 10), you can edit the table to get the results you're looking for. You can use the field calculator to edit the fields or edit them manually in an edit session. Of course, be careful manually editing the table, as you can possibly change values in a way that will not be good. Luckily this is only the table, you do not edit the source data.
Robert