Solution : https://service.sap.com/sap/support/notes/140071 (SAP Service marketplace login required)
Key words : 
symptom r3up reports terminations, additional key words upgrade, upgrade phase pcon_<rel>, missing database resources, terminated background jobs, pcon_<rel>, conversion terminated, release upgrades, inconsistent buffers, solution restart
Related Notes : 
       
| 435140 | Additional information on upgrading to Basis 4.6D (APO 3.1x | 
| 420371 | Add. info on upgrading to Basis 4.6C SR2 (NDI upgrade) | 
| 390062 | Additional information about upgrading to 4.6C SR2 | 
| 335029 | Additions to the upgrade to Basis 4.6D (NDI Upgrade) | 
| 329622 | Additions: Upgrading to Basis 4.6C SR1 (NDI upgrade) | 
| 327285 | Additions to upgrade to 4.6C SR1 | 
| 304597 | Additions to upgrade to Release 4.6C FCS | 
| 192949 | Additional info for upgrade to 4.6C | 
| 179373 | Additional info for upgrade to Rel.4.6B | 
| 153225 | Load error char. conflict incorrect message C1813 | 
| 151833 | Additional Info: Upgrading to FCS 4.5B | 
| 147337 | Additional info for upgrade to Release 4.0B SR | 
| 117668 | Additional info: Upgrading to 4.5B | 
| 116251 | Additions upgrade to Basis 4.5A (comp.system) |