This switch is located at Channel>Channel Settings>Walmart Settings tab.
When this switch is enabled, SA will send the product ids as text “CUSTOM” if the product id fields are empty. This is useful when you have a product id exception for Walmart, and you want to use this for all empty barcoded products in your Walmart channel. By using this setting, you don’t need to enter “Empty” for all products in your channel separately. SA will find and act for these types of products that do not have product ids when this switch is enabled.
IMPORTANT NOTE: This setting will be applied to the product with no product ids on your related Walmart channel.