When importing metafields with spaces in the namespace or key, you need to escape the spaces with a backslash (). For example, your metafield woo_attribute.Inclusief lichtbron should be formatted as woo_attribute.Inclusief\ lichtbron.
Here's how you can do it:
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Export your data from WooCommerce.
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In the exported file, locate the columns with the metafields that have spaces in the namespace or key.
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Replace the spaces with \ (backslash followed by a space). For example, woo_attribute.Inclusief lichtbron becomes woo_attribute.Inclusief\ lichtbron.
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Save the file and import it into Shopify using the DataEase app.