Math between multiple REDUCE

[DoanManhQuynh]

Hi.

I want to count distinct value in 2 difference internal table then sum so I do as below:

CNT_FINAL = ( REDUCE I( INIT CNT1 = 0
                        FOR GROUPS OF M1 IN GRP1 GROUP BY M1-ID
                        NEXT CNT1 = CNT1 + 1 ) ) +
            ( REDUCE I( INIT CNT2 = 0
                        FOR GROUPS OF M2 IN GRP2 GROUP BY M2-ID
                        NEXT CNT2 = CNT2 + 1 ) ).

but the result is not correct. if i change like this ( calculation in 2 steps ), it correct:

CNT_FINAL = REDUCE I( INIT CNT1 = 0
                      FOR GROUPS OF M1 IN GRP1 GROUP BY M1-ID
                      NEXT CNT1 = CNT1 + 1 ).
CNT_FINAL = CNT_FINAL +
            REDUCE I( INIT CNT2 = 0
                      FOR GROUPS OF M2 IN GRP2 GROUP BY M2-ID
                      NEXT CNT2 = CNT2 + 1 ).

so I don't know is there any restrict to do the calculation between 2 REDUCE or not.

My pseudo code:

DATA CNT_FINAL TYPE I.
TYPES: BEGIN OF TY_GRP,
         ID  TYPE C,
         DAT TYPE C,
       END OF TY_GRP.
DATA: GRP1 TYPE TABLE OF TY_GRP,
      GRP2 TYPE TABLE OF TY_GRP.
GRP1 = VALUE #( ( ID = 1 DAT = 'a' )
                ( ID = 1 DAT = 'x' )
                ( ID = 2 DAT = 'b' ) ).
GRP2 = VALUE #( ( ID = 3 DAT = 'a' )
                ( ID = 4 DAT = 'b' ) ).
" Correct
CNT_FINAL = REDUCE I( INIT CNT1 = 0
                      FOR GROUPS OF M1 IN GRP1 GROUP BY M1-ID
                      NEXT CNT1 = CNT1 + 1 ).
CNT_FINAL = CNT_FINAL +
            REDUCE I( INIT CNT2 = 0
                      FOR GROUPS OF M2 IN GRP2 GROUP BY M2-ID
                      NEXT CNT2 = CNT2 + 1 ).
BREAK-POINT.
" Not correct
CLEAR CNT_FINAL.
CNT_FINAL = ( REDUCE I( INIT CNT1 = 0
                        FOR GROUPS OF M1 IN GRP1 GROUP BY M1-ID
                        NEXT CNT1 = CNT1 + 1 ) ) +
            ( REDUCE I( INIT CNT2 = 0
                        FOR GROUPS OF M2 IN GRP2 GROUP BY M2-ID
                        NEXT CNT2 = CNT2 + 1 ) ).
BREAK-POINT.