The 'cashup' functionality introduced by bug 23355 is currently only available via the point of sale module payment page; however such functionality only relies upon cash registers having been defined and as such may be used without enabling point of sale as a module. We should add an entrance point to this functionality elsewhere for such a case.
*** This bug has been marked as a duplicate of bug 24492 ***
Bug 24492 introduces a route to cashup without having point of sale enabled :)