When you want to purchase fixed asset through purchase order you create a line and in line details you mark it is a new fixed asset and add fixed asset group. then if you have 3-way matching you also create product receipt and then pending vendor invoice. in this step fixed asset group is not transferred to pending vendor invoice. Since there is a field on PVI for fixed asset group I think it would only make sense for it to be transferred from PO to PVI. we had already a few clients who had a request for this step.