SID table in the general tab and master data/text tab

Question

Hello Bi Experts,
  For example 0material Info-object:
There is a SID table in the general tab i.e /BI0/SCOMP_CODE
There is another  SID table Attribute  in the master data/text tab i.e /BI0/XCOMP_CODE,here there are Nav attributes with name S__0COMPANY.
When i got 0company info-object it got its own SID table i.e /BI0/SCOMPANY
Can some body explain me what is significance of SID table Attribute  in the master data/text tab and what is difference with SID Table of attribute?
Cheers,
Stalin

Answer 1

Hi,
SID is surrogate ID generated by the system. The SID tables are created when we create a master data IO. In SAP BW star schema, the distinction is made between two self contained areas: Infocube & master data tables/SID tables.
The master data doesn't reside in the satr schema but resides in separate tables which are shared across all the star schemas in SAP BW. A numer ID is generated which connects the dimension tables of the infocube to that of the master data tables.
The dimension tables contain the dim ID and SID of a particular IO. Using this SID the attributes and texts of an master data Io is accessed.
The SID table is connected to the associated master data tables via teh char key 
Sid Tables are like pointers in C
Tables Starting with  Description:
M - View of master data table 
Q  - Time Dependent master data table 
H - Hierarchy table 
K - Hierarchy SID table 
I  - SID Hierarchy structure 
J  - Hierarchy interval table 
S  - SID table 
Y  - Time Dependent SID table 
T  - Text Table 
    F  - Fact Table - Direct data for cube ( B-Tree Index ) 
E  - Fact Table - Compress cube ( Bitmap Index ) 
For more info go through the belwo link
http://www.sap-img.com/bw010.htm
Regards,
Marasa.