1707793 - Error: Cannot process expression <System.Access.WAS.protocol>

Portal Runtime Error occurs when AI iView connects to the backend:
Cannot process expression <System.Access.WAS.protocol> because Invalid System Attribute:

 

You can check the following exception in default trace file:

Caused by: com.sapportals.portal.appintegrator.template_processor.context.ContextException: Invalid System Attribute:
System: 'System Alias: <ALIAS_NAME>, System ID: <pcd:portal_content/...  pcd path to the system object>',
Attribute: 'protocol'.

[EXCEPTION]
com.sapportals.portal.appintegrator.ApplicationIntegratorException: Unable to parse template '<System.Access.WAS.protocol>://<System.Access.WAS.hostname>/sap/bc/webdynpro/<WebDynproNamespace>/<WebDynproApplication>;sap-ext-sid=<ESID[URL_ENCODE]>?sap-ep-iviewhandle=007<ESID[HASH]>&sap-wd-configId=<WebDynproConfiguration>&sap-ep-iviewid=<IView.ShortID>&sap-ep-pcdunit=<IView.PCDUnit.ShortID>&sap-client=<System.client>&sap-language=<Request.Language>&sap-accessibility=<User.Accessibility[SAP_BOOL]>&sap-rtl=<LAF.RightToLeft[SAP_BOOL]>&sap-ep-version=<Portal.Version[URL_ENCODE]>&sap-wd-tstamp=<$TimeStamp>&<FPNInfo[IF_false PROCESS_RECURSIVE]>&sap-explanation=<User.Explanation[SAP_BOOL]>&sap-ls-useAnimation=<User.DisableAnimation[OMIT BOOL_NEGATE SAP_BOOL]>&<StylesheetIntegration[IF_true PROCESS_RECURSIVE]>&<Authentication>&<DynamicParameter[PROCESS_RECURSIVE]>&<ForwardParameters[QUERYSTRING]>&<ApplicationParameter[PROCESS_RECURSIVE]>'; the problem occured at position 0. Cannot process expression <System.Access.WAS.protocol> because Invalid System Attribute:
System: 'System Alias: <ALIAS_NAME>, System ID: <pcd:portal_content/... pcd path to the system object>',
Attribute: 'protocol'.

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SAP Netweaver Enterprise Portal Release Independent

SAP NetWeaver 2004 ; SAP NetWeaver 7.0 ; SAP NetWeaver 7.3 ; SAP NetWeaver 7.4 ; SAP NetWeaver Application Server for Java 7.1 ; SAP NetWeaver Application Server for Java 7.2 ; SAP NetWeaver Composition Environment 7.1 ; SAP NetWeaver Composition Environment 7.2 ; SAP enhancement package 1 for SAP NetWeaver 7.0 ; SAP enhancement package 1 for SAP NetWeaver 7.3 ; SAP enhancement package 1 for SAP NetWeaver Application Server for Java 7.1 ; SAP enhancement package 1 for SAP NetWeaver Composition Environment 7.1 ; SAP enhancement package 2 for SAP NetWeaver 7.0 ; SAP enhancement package 3 for SAP NetWeaver 7.0

system landscape, alias, ITS, Message Server, logical system name, WAS host protocol system object settings , KBA , EP-PIN-AI , Application Integration , EP-PIN-PSL , Portal System Landscape , Problem