2552503 - GETWA_NOT_ASSIGNED on MPOS

Consistency check report /SAPAPO/TS_LCM_CONS_CHECK or /SAPAPO/TS_PSTRU_TOOL dumps with GETWA_NOT_ASSIGNED.
The dump happened in method GET_PLOBS_POST in a generated class program, at coding similar to below.

|   22|*&---------------------------------------------------------------------*                   
|   23|*& (2) Post processing of planning objects                                               
|   24|*&---------------------------------------------------------------------*                  
|   25|                                                                                          
|   26|*#TR# (2.1) Determine used aggregate (if LV_USED_AGGREGATE is initial, we read from the basi
|   27|    IF iv_used_aggregate IS NOT INITIAL.                                                    
|   28|      mo_scmb_pstru_relation->get_aggregates(                                               
|   29|        EXPORTING                                                                           
|   30|          iv_bas_plobid      = gc_plobid                                                    
|   31|        IMPORTING                                                                           
|   32|          et_plobid          = lt_plobid                                                    
|   33|            ).                                                                              
|   34|                                                                                            
|   35|      APPEND gc_plobid TO lt_plobid.                                                        
|   36|                                                                                            
|   37|      mo_scmb_pstru->retrieve(                                                              
|   38|        EXPORTING                                                                           
|   39|          it_plobid        = lt_plobid                                                      
|   40|        IMPORTING                                                                           
|   41|          et_plobko        = lt_plobko                                                      
|   42|            ).                                                                              
|   43|                                                                                            
|   44|      READ TABLE lt_plobko WITH KEY ancid = iv_used_aggregate ASSIGNING <ls_plobko>.        
|   45|      ASSERT ID /sapapo/scmb_pstru_plob CONDITION sy-subrc = 0.                             
|   46|      ev_used_pstru = <ls_plobko>-plobid.                                                   
|>>>>>|    ELSE.                                                                                  
|   48|      ev_used_pstru = gc_plobid.                                                            
|   49|    ENDIF.                                          

• SAP Supply Chain Management (SCM)
• Advanced Planning and Optimization (APO)
• SAP enhancement package for SAP Supply Chain Management
• SAP Supply Chain Managment Demand Planning (SCM-APO-FCS)  

Fixed Aggregate , KBA , SCM-APO-FCS-BF , Basic Functions , Problem