Macro to assign zero values to a Key Figure

Hi All,

I am still learning APO so am struck in one simple macro...

My requirement is if the result of calculation is negative then assign 0 value else the result to a Key Figure.

I have written a macro as below... Please share your experiences with me...

STEP - Calculation

  IF

IS_INITIAL ( KF1) <> 1

    Row KF2 = KF1-KF3

    Else

   Row KF2= KF4 - KF3

   End IF

IF

KF2 < 0

KF2= 0

End IF

I know there is some mistake in this logic not able to think what I should do.

My requirement is if the resultant KF2 is negative then assign 0 value to it else keep the value getting in the subtraction formula.

Thanks in advance,

Regards,

Prabhat