workflows configuration is independent of procurement hierarchy.
if you have set procurement hierarchy in any workflows configuration, that is just optional
so 1st believe you need to avoid and know that procurement hierarchy has nothing to do with a workflow configuration in general.
regarding your issue, where you was unable to get submit button, I can sense/feel that it was non-availability of any active workflow configuration, due to which workflow was not being submitted (i mean yellow bar was not coming there)