The Error Messages page is a nice way to display errors when posting a sales/purchase document to the user - but it is difficult to troubleshoot as no error is actually thrown. The user navigates to the "Latest Error" details and gets a message and callstack that is unrelated to the document that they just tried to post.

It would be very useful to record the callstack on the error messages page (or maybe display a message with the callstack from an action on that page). Identifying the cause of the problem and fixing it would be a lot easier.