How to Calculate Avg Stock

Question

Hi Experts,
User wants to see Avg stock in the report
say stock values are as following
MONTH-StockReceipts- Sales- Closingstock 
1-          365-     12-     353
2 -          0-     89-     264
3-          0-     80-     184
4-          0-     110-     74
5-          0-     12-     62
6-          365-     24-     403
7-          0-     110-     293
8-          0-     12-     281
9-          0-     67-     214
10-          0-     90-     124
11-          0-     100-     24
12-          0-     24-     0
if user enters 01.01.2011 to 31.12.2011
Avg stock  should be 189.6(this is the avg of closing stock)
in this example total Stock Receipts 730, Sales 730 and Clsoing stock on 31.12.2011 is 0.
in the Report along with this Avg stock there are other key figures also.
how can we calculate the avg stock value based on every month closing stock between the time interval.
say if user enter 01.01.2011 to 31.12.2011 then i ahve to consider the 12 periods closing stock
Regards,
Chandra

Answer 1

Dear Chandra,
Are those months 1 2 3... all selections? i.e there is no calmonth out of the structure isn' it? Then yes my reply doesn't work.
Because the formula is wrong.Not the key figure .I think you don't have to create lots of key figures.This unique key figure of closing stock is restricted by the user's input and takes the value of everything between that input.E.g if the user inputs 05.02.2011-17.08.2011 then the key figure must take the sum of the values of closing stock between that date, in my opinion.
Now let me correct the formula, you must divide this key figure to the number of months(forget about the average, it was wrong). And number of months between the user input interval must be calculated by the ABAP code i.e a user exit variable.
Hope it helps,
Sunny