How to search labels in dropdown

[rheinisaac]

Hi, 
Your help will be really appreciated

So I have 3 tables related to this concern,
Product table = Contains ProductID(Key),ProductName(label) and more details
Stock Table = References ProductID , contains quantity, cost, and srp
OrderDetails= references Stockid , Soldprice and quantity

Now, Here is the dropdown from orderdetails view


But when I type the product name in search bar, in this case, I'll search for "One piece Keychain PVC"


I believe the search bar uses the productID key value that's referenced in the Stock table instead of the label.
This will lead to a problem when my employee tries to search for an item.

Any idea how to solve this ?