Solution : https://service.sap.com/sap/support/notes/314952 (SAP Service marketplace login required)
Key words : 
upgrade procedure additional key words, system issues error message 3petg447, includes db2/390-specific problems, cd rom iv  activities, delete table sdbaddb2 immediately, symptom problems occur, delete table sdbaddb2, /  important general remarks, important general remarks, ptf check tool
Related Notes : 
       
| 315377 | Additional information about upgrading to 3.1I SR1 |