The general requirement is that visualizations (Power View, SSRS etc...) must not circumvent existing policies, or introduce yet another set of security policies on top of those already implemented at the source. * For example, a visualization of sales data needs to reflect the policy that account managers can only read sales data for their region. * For performance reasons, this is enforced at the source by injecting predicates into the query based on the end users identity. If identities for end users are not passed down the process chain into the data layer, it leaves us little option but to publish individual reports for every region, which results in an explosion of complexity and numbers of reports, or move the whole model to BISM and manage the policy in yet another place (namely the BISM model). Impact blocking migration to SPO/BI Sites. At least 412 Site Collections with more than 600 Power Views. Impacting Adoption or migration for majority of BPUs - e.g. Finance, LCA, HR, etc