Solution : https://service.sap.com/sap/support/notes/805459 (SAP Service marketplace login required)
Key words :
/platforms -> product availability matrixsince, sap product availability matrix, symptom sap terminates maintenance, terms downard-compatible kernel, sap urgently recommends, date kernel patches, os400 v5r1 reason, terminating maintenance, downward-compatible 6, kernel problem
Related Notes :
| 803429 | Desupport 6.20 kernel |
| 664679 | Installing 6.40 kernel in SAP WEB AS 6.10/6.20 |