3583616 - Error "UNKNOWN_VARIABLE" Triggered When Launching W0191 in SAP S/4HANA

• An error "Exception condition "UNKNOWN_VARIABLE" triggered" is encountered when trying to launch W0191 (Period Budget and Commitment/Actual Line Item Analyzer) in SAP S/4HANA.
• When executing the query 2CCFMBPERACTANQ in transaction RSRT, dump happens as below:
  
  Category               ABAP programming error
  Runtime Errors         RAISE_EXCEPTION
  ABAP Program           SAPLRRS2
  Application Component  BW-BEX-OT
  ...
  Short Text
      Exception condition "UNKNOWN_VARIABLE" triggered
  ....
     48   " process current variable
     49   READ TABLE l_s_var_exit_context-t_variable INTO DATA(l_s_var) WITH KEY name = i_vnam.
     50   IF sy-subrc IS NOT INITIAL.
  >>>>>     RAISE unknown_variable.
     52   ENDIF.
  ....

SAP S/4HANA

W0191, UNKNOWN_VARIABLE, RSRTS_CDS_VAR_EXITS, FIORI ID, Period Budget/Commitment/Actual Line Item Analyzer , KBA , BW-BEX-OT-ODP , Query Runtime for Operational Data Provisioning , Problem