I was trying to link the POs with the actual confirmation documents I get from the suppliers. Meta Data fields would be great for this, but it seems the API doesn’t really support these. I tried both directions:
1. Create Meta data PO header fields via API. > Nothing happens. No error, but no fields attached either.
2. Create fields manually in the Woocoommerce backend and retrieve PO via API. > No Meta data array included.