To determine the SAPUI5 patch level in an AS ABAP-based SAP system, one should check the version of the software component SAP_UI (C). This component includes the SAPUI5 libraries and their versions, providing a clear indication of the SAPUI5 patch level currently deployed on the system. The software component version can be viewed in the system via transaction codes such as 'SPAM' or 'SAINT', which display information about installed software components and their versions. Programs like
'WDG_MAINTAIN_UR_MIMES' (A) and '/UI5/UI5_UPLOAD_PATCH_TO_MIME' (D), as well as services like '/sap/public/bc/ui5_ui5' (B), are related to specific maintenance tasks or services and do not directly provide information about the SAPUI5 patch level.