this is a bit of a point i have been trying to understand, over the past few months or so, only today, i found an interesting SAP reference.
i supports a notion of pointing the Corporate Memory (CM) to the PSA. in other words, use the PSA as the CM.
here is a link to BI Content
half way down the page is says this
Three-layer approach to the enterprise data warehouse
i wish to point out this bit PSA serves as the historical data foundation
we all come to learn that the CM serves as the untainted source for history and reloading, so, why dont we just use the PSA these days as the CM. after all, technically, the difference between a w-o DSO and a PSA are nearly the same.
i am aware that you cannot query over the PSA, so would the be the sole reason for separating out the CM in it's own w-oDSOs ?