SAP table AFAB has 7 primary key fields being MANDT,AUFPL_VOR,APLZL_VOR,AUFPL_NCH,APLZL_NCH,AOBAR,MIMAX.
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
AUFPL_VOR
No. identifying the network to which the predecessor belongs
NUMC
10
0
AUFPL_VOR
APLZL_VOR
Internal counter
NUMC
8
0
CIM_COUNT
AUFPL_NCH
No. identifying the network to which the successor belongs
NUMC
10
0
AUFPL_NCH
APLZL_NCH
Internal counter
NUMC
8
0
CIM_COUNT
AOBAR
Type of relationship
CHAR
2
0
AOBAR
MIMAX
Indicates whether maximum time interval will be considered