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Field with SKU entityreference lookup (views) stores title in field after saving

I'm using Ubercart in a D7 site. In one content type, I have an entityreference field using a views entityref to lookup products by SKU. However, when I select a product and save the node, then edit the same node, the product title shows in the entityref field instead of SKU.

In Views, the entityreference is set as follows...

Format: Entity Reference list - with only Product: SKU selected in search settings.
Show: Inline fields (the only radio button available) - again with only Product: SKU selected.
In the "Fields" section, only Product: SKU is being output; all other fields (including title) are set to "Exclude from display".

I'm not sure what other settings are important for this issue. Any help would be greatly appreciated.