0CALMONTH Summation issue

Hello,

We are having an issue where values are not getting summed up properly when summed up using only characteristics 0CALMONTH.

Here is the scenario with issue.

1)

--> 0CALMONTH  Total

     01.2015            100

------------------------------------

Result                    100

-----------------------------------

2)

---> 0CALMONTH     MatType      Total

       01.2015                     A             20

                                        B            70

                                        C            18

----------------------------------------------------------

     Result                                      108

----------------------------------------------------------

Calculation 'result as' for Total KF is Summation. But when MatType is removed, it is giving wrong values when aggregated using 0CALMONTH characteristics as shown 1), Please help.

regards,

V