Solution : https://service.sap.com/sap/support/notes/124383 (SAP Service marketplace login required)
Key words :
symptom wrong atp overview, additional key words j3ad, mm/pp status, sales orders, advanced correction, prerequisites, determined, thiscauses
Related Notes :
163832 | SUM: ATP all existing availability check notes |
129937 | AFS V1.0D Fixpack #2 |