Using "Manufacturer's Items" - inconsistent results

We're using this feature to "auto populate" the customer item number in OE.  The situation we have is that there can be multiple "our" item numbers for every one of "their" item numbers.  IOW, we have item 'ABC' and 'DEF' and their item number for both is '123'.   When we enter 123 in the OE detail item number field, it pops up a list of "our" numbers to chose from.  But this doesn't happen for all items where we have this set up.  So, where we have our item 'GHI' and 'JKL' that tie to our customer's part number '456', it doesn't give me the list to chose from, it just chooses the first item number that corresponds to the item entered and uses that to populate the OE item number .  It always gives me the list to pick from for items where this cross reference works, always fails for those that don't (so we're not dealing with totally random success or failure).  

But we can't see what is different between the two sets of data that would cause one set to work, the other one not.  

Are there any known settings or reasons that would explain this?

We're on v 2014 PU1, but it fails equally in v 2012 PU3.

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