Check talbe in the mapping sheet

Question

Hello Gurus,
      following is a line from mapping sheet, what is check table used for in our sap bw project in general sense ?
R/3 Table                      R/3 Field Name    R/3 Field Type    R/3 Field Length      R/3 Check Table                Datasource
/SAPSLL/SPLAUD     GRVSY           CHAR                 10                 /SAPSLL/TCOGVS           ZSAPI_Z_BIW_SPLAUD_BW
Many thanks

Answer 1

Hi
Value Table :
This is maintained at Domain Level.
When ever you create a domain , you can entered allowed values. For example you go to Domain SHKZG - Debit/credit indicator. Here only allowed values is H or S.
When ever you use this Domain, the system will forces you to enter only these values.
This is a sort of master check . To be maintained as a customization object. This mean that if you want to enter values to this table you have to create a development request & transport the same.
Check table :
For example you have Employee master table & Employee Transaction table.
When ever an employee Transacts we need to check whether that employee exists , so we can refer to the employee master table.
This is nothing but a Parent & Child relationship . Here data can be maintained at client level , no development involved.
As per DBMS what we call foregin key table, is called as check table in SAP.
There is 1 more important Difference in Value Table and Check Table is that:
1. The contents of the check will be used as an input help(F4 Help) for a particular field on which a check table is assigned.
But the contents of Value Table are never used in Input Help.