How can I calculate freight using Conditions ME21N

HI Friends,
I have a problen calculating freight in Purchase Order, For that reason I create a Z Condition, my problem is I would like to get for each position a propotional value of general freight( in the Purchase Header)
I create an exit in VOFM but I couldn't modify the condition value.
Thanks

"If you want to reduce the figures down to their simplest form i.e. 2:1 then that's another matter"
And a fairly simple one :-) Since division always give you a ratio x:1, something like:
SQL> WITH t AS (SELECT 'M' sex FROM dual CONNECT BY rownum<=200
2             UNION ALL
3             SELECT 'F' FROM dual CONNECT BY rownum<=100)
4 SELECT 'Ratio M:F is '||ROUND(male/female, 2)||':1' ratio
5 FROM (SELECT COUNT(DECODE(sex, 'M', 1)) male,
6               COUNT(DECODE(sex, 'F', 1)) female
7        FROM t);
RATIO
Ratio M:F is 2:1John

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