After the barcode is scanned in POS, it is handled according to a pre-defined order and logic, which prevents problems in case of overlapping barcodes for products/customers (the first match found is used):
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Check weight/price barcode rules.
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Find product by SKU.
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Find product by barcode.
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Find product by input masks.
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Find Customer card.
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Find product by ID.
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Check payment input masks.
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Check customer input masks.
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Check external order barcodes.
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Check customer SSN code.
If there is no match, the user is allowed to create a new product, if the Creating New Products in the POS feature has been enabled.