I had created new release strategy and with all details required ..i mean class and characteristic.
and deleted all other codes and release groups.
but when i am creating po it's not showing any blockage though i simulated it correctly. and po is satisfying the block criterial..
and NOTE ...though i deleted all other release gr and other data..still it was showing the block due to old rel strategy and then i again created with same old data and created and deleted the data properly.