How to change location information under metadata tab?

Question

When I use the search box under the Places icon to assign a location to a photo, sometimes Aperture places a pin near but not directly on the place I have identified and puts an incorrect location in the tag.  If I zoom in, I can accurately place the pin, and the tag then changes to the correct location.  The problem is that both correct and incorrect locations display in the location box in the metadata field.  I've tried completely eliminating the incorrect location with Manage my Places.  I've tried removing the location from the photo and starting again.  In both cases, both original locations remain in the location box under the Metadata tab.  This makes using the search function for places worthless since there are so many false hits.
Is there anyway to modify the location box under the metadata tab once in contains inaccurate information?

Answer 1

I tried inserting a screen shot here, but I got a message that said "The content type of this image is not allowed."  Let me see if I can explain more clearly.
To assign places, I have begun by clicking on the Places icon on the upper right hand side of the screen where the choices are Browser, Split View, Viewer, Faces, Places, Loupe, Full Screen.  When I click on Places, I get a search box where I put the place I want to assign to a photo.  Sometimes, when I see the location I want in the search results and click on Assign, Aperture puts a pin close to the desired location (but not exactly on it) and gives it a random place name (not the one I chose).  If I zoom in and put the pin exactly where I want it, the place name changes to the one that I searched for to begin with.  So far so good.
On the left hand column of the screen, there are three tabs at the top of the column - Library, Metadata, and Adjustments.  If I click on the Metadata Inspector and look at the Location box at the bottom of that screen for the photo I've just described above, I see two locations listed - the first incorrect place name as well as the correct location that I changed it to when I moved the pin.
I've tried three things unsuccessfully to get around this problem.
  In the Metadata drop-down menu, I've used Manage Your Places to delete the wrong location altogether.  It disappears from my list of locations there, but it remains in the Location box for the in individual picture in the Metadata Inspector.  From the Action pop-up menu (the gear icon) for the individual photo in the Metadata Inspector, I've chosen Location Name and selected the single name that I want.  Both names remain in the Location box.  I've had a One-on-One session at the Apple Store.  (I took my computer with me so that she would see exactly what I was talking about.)  The woman there told me that she thinks that this is a bug, and she doesn't know how to get around it.  It was she who recommended that I try the Apple Support Communities to see if anyone has solved this.