https://userapps.support.sap.com/sap/support/knowledge/en/3261923
3261923 - CX_SHDB_PFW_EXCEPTION in phase PARRUN_CONF_REFCHAR, XPRAS_AIMMRG, etc. | SAP Knowledge...
When executing an upgrade via Software Update Manager, the upgrade is stopped in phase PARRUN_CONF_REFCHAR, XPRAS_AIMMRG, etc. Reviewing the upgrade logs...