Shipping label and error in Merchant centre

Hello, i’m a bit stuck with setting up different shipping costs per product.
In the feed I have changed the Shipping label from the standard setting (where it is completly controlled in Merchant center) to shipping class.
This way some products get the folowing in the xml
<g:shipping>brienvenbuspakje</g:shipping>
Or <g:shipping>pakket</g:shipping>

In merchant center I have added shipping rate > affected products filter > Filter products by shipping label. I have added two. One with the ‘brienvenbuspakje label and one with ‘pakket’label. Still all products are filed under ‘all other products’.

When i go to the products in merchant center I see the folowing eror:
Invalid format for sub-attributes [shipping] > Action: Include a separator symbol between each sub-attribute, and include all required sub-attributes

However I have no clue what I should do to get this working. Can you point me in teh right direction?