Best practice catalog management process for BPAs based on items / prices negotiated in Sourcing
We are implementing Sourcing and Purchasing to negotiate BPAs which later will be published as local catalogs for requesters as per the standard process. What we have difficult to understand is how we can give access to supplier users and catalog administrators to update / enrich search-related data elements / item attributes such as Image URLs without giving full access to change the BPA line items and unit prices which was the outcome of the negotiation.
We've seen / read that a suggested process where the category mgr or buyer would create the BPA header and send it for authoring, i.e. creation of lines, to a supplier user or internal admin. But what is the recommended way of working when using Sourcing to identify the line items and prices we should procure? (and the catalog authoring stage should be more of an "enrichment" of the BPA line)