SAP Message AD303 - Foreign key &-& (enter valid cardinality)

Diagnosis
You have defined a semantic foreign key without specifying thecardinality.

Procedure
Enter the cardinality. The following cardinalities are possible:

  • C A record of the check table may be referenced by at most one
    • dependent record.
    • 1 Each record of the check table is referenced by exactly one
      • dependent record.
      • CN A record of the check table is referenced by any number of
        • dependent records.
        • N A record of the check table is referenced by at least one
          • dependent record.