Being function leader myself, I would like to have transparency on resource expectations. Without this, it would be a hard sell for any function team staffs to manage its day-to-day reporting together with PMI project, as the function leader has to manage its own resources to manage operational matters. Bottom line is for the managers involved to know the expectations upfront as well as at all times during the PMI process, so that resource allocation can be made effectively not just within the PMI circle but with the day-to-day operations. (I know that the better practice would be to have a dedicated PMI resource, but that just does not happen usually unless your company is involved in M&A activities all the time.)