Validation of Key Figure In SAP IP

Hi All,

I am new to SAP IP and have to create a planning function to check the total of a key figure distribution equal to 100 percent.

Data like :

ColumnA     CloumnB     ColumnC     ColumnD     ColumnD      Keyfigure
abc             def               ghi               a11             b11               30

abc               def               ghi              a22             b22               40

abc               def               ghi              a33              b33               30

I have to add the keyfigure for the combination of abc, def and ghi. In case the total is not 100, then display error.

Any pointers will be of great help.

Thanks in advance,

Priyanka