Thank you for your helpful answer,
Dear PRASOON, the screenshot is not displayed could you please upload it again.
Dear Dëv Päträ, When i made the perquisite as you mention it's working partially correct .. How ?
for X and Y release is possible for both X can release first or Y can release first but Z will not ba able to release unless both X and Y approved. have a look at the below screenshot Y released the doc but as you see Z still not able to release unless X approve i want Z to be able to release after the release done by either X or Y.. so please advice .. Thanks a lot