Scrum is very clear on this. The PO is in charge of the product backlog. The PO and PO only. If the business has some internal alignment she needs to go through

Scrum is very clear on this. The PO is in charge of the product backlog. The PO and PO only. If the business has some internal alignment she needs to go through then fine, but the development team doesn't have to care about that, which is great when it works and roles are respected.