Solution : https://service.sap.com/sap/support/notes/834116 (SAP Service marketplace login required)
Key words :
\web-inf\portal\system\xml, \web-inf\deployment directory, web-inf\deployment directory, prerequisites ep6 sp2, future deployment attempt, par file fails, actual par file, deployment directory, file system, symptom deployment
Related Notes :
1130469 | Deployment failure of PAR and EPA (EPT) files in the portal |