How To Fix AD303 - Foreign key &-& (enter valid cardinality)

AD303 - Overview

• Message type: E = Error

• Message class: AD - Data Dictionary application messages

• Message number: 303

• Message text: Foreign key &-& (enter valid cardinality)

What causes this issue?

You have defined a semantic foreign key without specifying the
cardinality.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Enter the cardinality. The following cardinalities are possible:
<LS>C</> A record of the check table may be referenced by at most one
dependent record.
<LS>1</> Each record of the check table is referenced by exactly one
dependent record.
<LS>CN</> A record of the check table is referenced by any number of
dependent records.
<LS>N</> A record of the check table is referenced by at least one
dependent record.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message AD303 - Foreign key &-& (enter valid cardinality) ?

  The SAP error message AD303, which states "Foreign key &-& (enter valid cardinality)," typically occurs when there is an issue with the definition of a foreign key relationship in the data dictionary. This error indicates that the cardinality defined for the foreign key is not valid or does not match the expected values.
  
  Cause:
  
  Invalid Cardinality Definition: The cardinality of the foreign key relationship is not correctly defined. Cardinality refers to the nature of the relationship between two tables, such as one-to-one, one-to-many, or many-to-many.
  Mismatch in Data Types: The data types of the foreign key and the primary key do not match, which can lead to issues in establishing a valid relationship.
  Missing or Incorrectly Defined Foreign Key: The foreign key may not be properly defined in the database schema, or it may be referencing a non-existent primary key.
  Inconsistent Table Relationships: The relationships between tables may not be consistent, leading to ambiguity in