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This could be a language barrier thing, but I'm a bit confused.It sounds like the user will select a material from the second drop-down then scan a QR code that identifies the material they're scanning and that scan should match the selection from the second drop-down? If so, why? What's the thought behind making the user select a material from the second drop-down and then match that to the QR scan? Also, because the problem isn't clear at this point show the code you have, as well as any error messages or unexpected results you're getting. Assuming there's no error message and the results are unexpected, give us the results you were expecting.