How To Fix MC714 - Cardinality & of the foreign key &-& is not permitted here

SAP Error Message - Details

• Message type: E = Error

• Message class: MC - Aggregate: views, matchcodes, lock objects

• Message number: 714

• Message text: Cardinality & of the foreign key &-& is not permitted here

What causes this issue?

For maintenance and help views, there should be exactly one record pf
the dependent base tables for one record of the primary table.
For maintenance views, this is due to the maintenance interface
(transaction SM30).
For help views, this is the only way to uniquely display the records
found.
For this reason, the join conditions may only be derived from the
foreign keys of cardinality 1 or C (with respect to the dependent
tables) for these view types.

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?

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message MC714 - Cardinality & of the foreign key &-& is not permitted here ?

  The SAP error message MC714, which states "Cardinality & of the foreign key &-& is not permitted here," typically occurs in the context of data modeling or when working with database tables in SAP. This error is related to the cardinality constraints defined in the data model, particularly when dealing with foreign keys.
  Cause:
  The error arises when there is a mismatch in the expected cardinality of a foreign key relationship. Cardinality defines the number of instances of one entity that can or must be associated with each instance of another entity. Common cardinalities include:
  
  One-to-One (1:1)
  One-to-Many (1:N)
  Many-to-One (N:1)
  Many-to-Many (N:M)
  
  The error indicates that the cardinality defined for the foreign key relationship does not align with the data model's expectations or constraints. For example, if a foreign key is defined to allow multiple entries in a table but the corresponding primary key only allows a single entry, this inconsistency will trigger the error.
  Solution:
  To resolve the MC714 error, you can take the following steps:
  
  
  Review the Data Model: Check the data model to ensure that the cardinality of the foreign key relationship is correctly defined. Make sure that the foreign key and primary key relationships are consistent.
  
  
  Adjust Cardinality: If the cardinality is incorrectly defined, you may need to adjust it. This could involve changing the foreign key definition or modifying the primary key to ensure that the relationship is valid.
  
  
  Check Table Definitions: Ensure that the tables involved in the foreign key relationship are correctly defined in terms of their primary keys and foreign keys. Look for any discrepancies in the definitions.
  
  
  Data Consistency: Verify that the data in the tables adheres to the defined relationships. If there are existing records that violate the cardinality constraints, you may need to clean up the data.
  
  
  Consult Documentation: Refer to SAP documentation or help resources for specific guidance on cardinality and foreign key constraints in the context of your SAP module or application.
  
  
  Testing: After making changes, test the data model or the specific transaction that triggered the error to ensure that the issue is resolved.
  
  
  Related Information:
  
  Foreign Key Constraints: Understanding how foreign keys work in relational databases is crucial. They enforce referential integrity between tables.
  Data Modeling: Familiarity with data modeling concepts, including entity-relationship diagrams (ERDs), can help in visualizing and understanding cardinality.
  SAP Modules: The error may be specific to certain SAP modules (e.g., SAP BW, SAP ERP). Knowing the context can help in troubleshooting.
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message.
  
  If the problem persists after following these steps, consider reaching out to SAP support or consulting with a database administrator who has experience with SAP systems.