Solution : https://service.sap.com/sap/support/notes/1673399 (SAP Service marketplace login required)
Summary : Key words : Related Notes :
After an upgrade to PI 7.3, users may encounter a CPA Cache refresh failure with an error indicating lack of RFC authorization for 'PIDIRUSER'. This issue has been traced back to modified permissions stemming from SAP note 1232259, necessitating a logical destination on the Integration Server client post-upgrade. To resolve, create a service user 'PICACHEUSER' in SU01, assigning roles such as SAP_BC_WEBSERVICE_PI_CFG_SRV. Additionally, establish an ABAP connection "SAPXICACHE
assign abap roles sap_bc_webservice_pi_cfg_srv sap_sld_configurator sap_xi_cache_serv_user, sap-client=001returns status code '500', 3-digit integration server client number, section 'sp patch level', notify integration server affected, software component 'lm configuration', ctc upgrade configurations tasks, respective ctc upgrade wizard, <port>/sap/xi/cache, cpa cache refresh fails
1450419 Configuration Wizard: PI Upgrade EHP 1321868 Configuration Wizard: PI Upgrade 1232259 Security Note: Cache refresh with user change