With the release of SAP S/4 HANA On-premise Edition 1511 now released and available, there has not been any significant changes from ATP (Available-to-Promise) perspective which has direct business benefits. However, there will be future releases which will come up with such innovations. Below is the ECC ATP logic change which is part of this release.
Database table VBBS which contained aggregated sales requirements for the calculation of ATP will no longer be used. Instead, table VBBE will be used to refer to open quantity (OMENG) and confirmed quantity (VMENG) where each ATP-relevant requirement is explicitly stored. The old ERP ATP check coding will also refer to VBBE.
Reference Release Note: 2209696