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

You get a dump when navigating or carrying out certain actions in Project Management or Portfolio Management. The dump information in the backend (transaction ST22) 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 "<ds:xxxxxx>" is not permitted

The dump 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, navigation, Project Management, Portfolio Management, Quick Help, WebDynpro, data element, AD_CITY1, WD_CONF_USER , KBA , PPM-CF , Common Functions , Problem