Extend VIS S*** Table with custom characteristics

Hi Forum,

I have a Statistic Table defined using the following key figures:

Sales Organization              MCVBAK     VKORG    
Distribution Channel            MCVBAK     VTWEG    
Business type                   MCVBAP     ZZGART   
Sales Document                  MCVBAK     VBELN    
Sales Document Item             MCVBAP     POSNR    
Sold-to party                   MCVBAK     KUNNR    
Division                        MCVBAP     SPART    
Partner                         MCVBPA     KUNNR

Now I have to add one more characteristics field, that depends on:

1. BusinessType (VBAP-ZZGART)

2. Division (VBAP-SPART)

3. Partner (VBPA-KUNNR)

The Problem is here, that I am not able to fill the new field on partner level, because in 99% I will have only partners on header level.

Is there any way to put custom ABAP into the Statistic program, that will fill the field?

It seems not a good Idea to change the automatically generated Statistic Report RMCX000**, at least it is saying "Do not chang this Report!!!"

Any Ideas are welcome.

thanks

Dennis