Admin Order page: Filter by SKU
I need to add filtering by SKU on the order admin page (admin/commerce/orders). By default the filtering is by username, email and order ID.
If the admin view for order is somehow related to this issue, then I've another problem - I can't add Line item to Relations (so I can't add any line item reference field to relations, fields, etc.). Any help enabling this line item in the available selection fields would be great.