Exclude products without GTIN | WordPress.org

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Hi,

My question is about a shop that has a valid licence, but I assume the method is the same.
How can I exclude products from the feed that dont have a value in the GTIN field?
I tried setting the filter: if wppfm_product_gtin ‘is not empty’ on the GTIN field that is set to use the values from the contents of the : wppfm_product_gtin .

It does not seem to work though, the feed still contains products without a GTIN number.

Many thanks in advance!

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