I suspect you might need to reference the metafield namespace and key as well — so something like metafields_item.custom.vat_customer.value instead of metafields_item.value but hard to tell from screenshots. You should also be able to find the individual metafield key in the variable picker and drop in the correct reference. Do you have a link to the workflow?
Yeah I assume I need to fill in the metafield references somehow but I can’t seem to pass that info without getting errors no matter how I format. I’ve exported and uploaded to wetransfer below. https://we.tl/t-T0TwlG0qzY
I am not able to find any specific metafields in the variable selector. It only allows to select “metafields” then “value”.
From the variable picker, you can select or add metafield definitions for orders, products, customers, etc. Does that help you find the path to the relevant metafield?
Also, liquid can be a bit complicated and problems aren’t obvious. Using a Log output action can make it easier to debug the results of your expressions until you get the desired result.