SAP table EOPGROUP has 2 primary key fields being MANDT,OPGROUP.
If you're only analyzing data from a single SAP instance you may omit field MANT in your relationships as it will we the same across the entire dataset. On the other hand, if you're combining data from multiple SAP instances you need to take MANDT into account.
Field
Description
Data Type
Length
Decimals
Checktable
Data Element
MANDT
Client
CLNT
3
0
*
MANDT
OPGROUP
Operand group
CHAR
10
0
OPGROUP
TOPOPGROUP
Upper-level operand group that contains the operand group