Organisation of dimensions and characteristics

Question

Hi gurus,
I have one basic question about modeling with dimensions. I am still learning and trying to better understand.
I saw the scenario 1 and thought it is wrong.
So I thought scenario 2 would be a better solution.
Now I read that the scenario 3 is also possible.
If there is the current scenarios with the same characteristics but with different dimensions, what is the difference between them? Especially between 2 and 3.
The requirement would be for example:
Turn over for customer X with risk class 2 in month 03.2011.
Open items within sales division X for Customer X in month 05.2011.
Turn over for business segment X in month 02.2011.
Turn over for customer X in country US with risk class 5 in month 01.2011.
Wouldn't it be possible to achieve that with scenarion 2 and 3 and is there any reason why not with scenario 1?
Thank you in advance for your help!
Scenario 1:
Dimensions:
Organisational units
Company code
Credit control area
Customer number
Profit Center
Business unit
Business segment
Sales organisation
Sales division
Distribution channel
Time
Calmonth
Risk class
Risk score
Country
Country
Facts:
turn over
open items
Scenario 2 (data model changed/ separated dimensions):
Dimensions:
Company code
Credit control area
Company code
Customer
Customer number
Profit Center
Profit center
Business segment
Business unit
Sales organisation
Sales organisation
Distribution channel
Sales division
Time
Calmonth
Risk class
Risk score
Country
Country
Facts:
turn over
open items
Scenario 3:
Dimensions:
Customer
Customer number
Organisational units
Company code
Credit control area
Profit Center
Business unit
Business segment
Sales organisation
Sales division
Distribution channel
Time
Calmonth
Risk class
Risk score
Country
Country
Facts:
turn over
open items

Answer 1

This is like below...
Let's say you have 3 characteristics under one dimension Material, Color, Type. Your fact table contains Amount.
Your Time Dimension contains Cal/Day and Cal/Year
You got one record from Source 
Material, Color,   Type.          Cal/Day          Cal/Year    Amount
M01          Red    Software     01.01.2011      2011          $ 100
Material Dimension:
DIMIDl | SID_MATERIAL | SID_COLOR | SID_TYPE
1111                    1001           |2002 | 3003   
So here dimension id 1111 represents Material m01, of Color Red of Type Software.  So basically your dimension ids are combination of SIDs of characteristics.
Now the link between Material number and SID can be found in SID table of InfoObject
Similarly, say ur Time dimension table has one id 2222..which means 01.01.2011 and 2011.
So your Fact table will contain.
KEY_DIM_MATERIAL  |  KEY_DIM_TIME   |  KeyFigure
1111                                2222                 | $100
NOw you can see wherever you put one characteristics , different combination of SIDs will generate one DIM id which can determine one transaction record uniquely.
Regards
Anindya