Solution : https://service.sap.com/sap/support/notes/204109 (SAP Service marketplace login required)
Key words :
transaction se11 - change table j_3abdsi indexes - create, mandt werks matnr mbdat, 2 million data records exist, additional key words atp, afs atp search period, afs requirements table, afs search horizon, data volume reaches, attached advance corrections, short text fields
Related Notes :
| 204490 | ATP: poor performance |
| 163832 | SUM: ATP all existing availability check notes |