2166738 - Dump with exception LCX_VALIDATION_ERROR and "Tag ... is not permitted" in PPM

You get an exception when navigating or carrying out certain actions in Project Management or Portfolio Management.

The error screen in the frontend shows a message:

500 Internal Server Error
Exception CL_WD_FORMATTED_TEXT\CLASS=LCX_VALIDATION_ERROR occured because of error : Webdynpro Exception: Tag "<xx:xxxxxx>" is not permitted
(Message E WEBDYNPRO_RT 007)

If there is a corresponding dump in the backend (transaction ST22), it includes the following information:

Runtime Errors         UNCAUGHT_EXCEPTION
Except.                LCX_VALIDATION_ERROR

Error analysis
An exception has occurred in class "LCX_VALIDATION_ERROR". As this exception was not caught, a runtime error occurred. The reason for the exception occurring was:
WebDynpro Exception: Tag "<xx:xxxxxx>" is not permitted

The dump/exception occurs in method WAD_TO_FORMATTED_TEXT of class CL_WD_FORMATTED_TEXT:

CL_WD_FORMATTED_TEXT
METHOD / WAD_TO_FORMATTED_TEXT
when others.
 ...
 raise exception type lcx_validation_error
  exporting
   msg = msg
   index = result-offset
   length = result-length.

• SAP Portfolio and Project Management (PPM)
• SAP Portfolio and Project Management for SAP S/4HANA (PPM)
• SAP Portfolio and Project Management in SAP S/4HANA (PPM)

dump, UNCAUGHT_EXCEPTION, LCX_VALIDATION_ERROR, WebDynpro Exception: Tag "<ds:re.saplszar>" is not permitted, Tag "<gl:company_code>" is not permitted, navigation, Project Management, Portfolio Management, Quick Help, WebDynpro, data element, AD_CITY1, WD_CONF_USER , KBA , PPM-CF , Common Functions , Problem