I am trying to use REST API to update simple products and product variations from a script to automate the process of syncing stock quantities with my inventory management system. The problem I am running into is that my variable products only have SKUs on the variations and not the parent and my program uses a CSV to match SKUs and update the stocks of them so it only ever gets the IDs of the variations and not the parent. This would be fine if I was able to use PUT to update the stock quantities of the variations but it says that it requires the parent product_id. Is there any way of working around this or would I need to consider switching all my products to simple products.