The other day I had to wear my SD hat and play around with some copy control settings. Exhibit A below shows the VTAA transaction where we can configure how one sales document type is copied to another. Many other config transactions look the same way.
There are tons of entries in the table and "Position..." button (what's the deal with ellipsis? something left unsaid?) at the bottom is supposed to help navigate it. If you click it, the "Another entry" pop-up appears. Hmm, do I use "SalesDoc Type" or "SalesDoc Type"? Decisions, decisions...
Well, thankfully it doesn't matter much because only one of them works anyway. If you put something in the first type field, it will take you to the entry where this type is in the "Target" column. So far so good. But if you leave the first field blank and put something in the second field then it does not take you to the entry where that value is in the "Source" column, as one might logically expect. In fact, it does absolutely nothing, you can click all you want. It's not going to tell you that it doesn't work if you don't put anything in the first "SalesDoc Type" and that there is no option to search by the Source column only. Bwahaha.
Good thing I'm not some helpless SD consultant but an ABAPer, so I go to SE16 and simply browse TVCPA table there, like a boss. 
Hopefully "the guided configuration" will put an end to this nonsense. Or will it? 