SAP table TA22RSS has 3 primary key fields being MANDT,BFNR,ENDDA.
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
BFNR
International Unique Train Station Number
INT4
10
0
TRAIN_BFNR
ENDDA
End Date
DATS
8
0
ENDDA
BF_BEZ_GK
Train station description
CHAR
20
0
TRAIN_STATION
WEGETEXT_GK
Train station description (route text)
CHAR
20
0
TRAIN_WEGETEXT
LEITPKT_KUERZEL
Abbreviation for station (route text)
CHAR
4
0
TRAIN_LEITPKT
LAND_KZ
Country/Region Key
CHAR
3
0
*
LAND1
VERKEHRSVERBUND
Abbreviation of corresponding integrated transport system