https://archive.sap.com/documents/docs/DOC-54254

Once in the planning view (/SAPAPO/RRP3) use the ok-code « gt_io » (First column is not orderID but ActivityID)

You’ll get ATP Category + OrderID that you can use in FM (SE37) /SAPAPO/OM_ORDER_GET_DATA (activating the « Uppercase/lowercase » box)

Use n/SAPAPO/OM16 to get internal Live-cache data