How To Fix USMD1049 - Data model &1, entity type &2, relationship &3: Cardinality is invalid

SAP Error Message - Details

• Message type: E = Error

• Message class: USMD1 - Datenmodel

• Message number: 049

• Message text: Data model &1, entity type &2, relationship &3: Cardinality is invalid

What causes this issue?

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

To use cardinalities in relationships, the following conditions must be
met:
For relationships of the type <LS>Referencing</>, only the cardinalities
<LS>1:N</> and <LS>0:N</> are permitted.
For relationships of the type <LS>Qualifying and Foreign Key
Relationship</>, only the cardinality <LS>1:N</> is permitted.
For relationships of the type <LS>Leading</>, only the cardinalities
<LS>1:N</> and <LS>1:1</> are permitted. The following also applies to
the cardinality <LS>1:1</>:
The to-entity type must have either the <DS:DE.USMD_USAGE_TYPE>storage
and use type</> <LS>1</> without an assigned data element, or <LS>4</>.
The to-entity type may not appear in any other relationship of the type
<LS>Leading</> or <LS>Qualifying</> as a to-entity type.
At least one of the conditions has not been fulfilled.
ELSE
To use cardinalities in relationships, the following conditions must be
met:
For relationships of the type <LS>Referencing</>, only the cardinalities
<LS>1:N</> and <LS>0:N</> are permitted.
For relationships of the type <LS>Qualifying and Foreign Key
Relationship</>, only the cardinality <LS>1:N</> is permitted.
For relationships of the type <LS>Leading</>, only the cardinalities
<LS>1:N</> and <LS>1:1</> are permitted. The following also applies to
the cardinality <LS>1:1</>:
The to-entity type must have either the <DS:DE.USMD_USAGE_TYPE>storage
and use type</> <LS>1</> without an assigned data element, or <LS>4</>.
The to-entity type may not appear in any other relationship of the type
<LS>Leading</> or <LS>Qualifying</> as a to-entity type.
At least one of the conditions has not been fulfilled.
ELSE
<LS>1:N</> is the only cardinality allowed for the relationship types
<LS>Leading </>and <LS>Qualifying</>.

System Response

The data model cannot be saved or activated.

How to fix this error?

Enter a different relationship type or a different cardinality.
ELSE
Enter a different relationship type or a different cardinality.
ELSE
Specify a different relationship type or define <LS>1:N</> as the
cardinality.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message USMD1049 - Data model &1, entity type &2, relationship &3: Cardinality is invalid ?

  The SAP error message USMD1049 indicates that there is an issue with the cardinality of a relationship in a data model. This error typically arises in the context of SAP Master Data Governance (MDG) when defining or modifying data models, entities, and their relationships.
  Cause:
  The error message USMD1049 is triggered when the cardinality defined for a relationship between two entity types is invalid. Cardinality defines the number of instances of one entity that can or must be associated with instances of another entity. Common cardinality definitions include:
  
  1:1 (one-to-one)
  1:N (one-to-many)
  N:1 (many-to-one)
  N:N (many-to-many)
  
  The error can occur due to several reasons:
  
  Incorrect Cardinality Definition: The cardinality defined in the data model does not conform to the logical relationships between the entities.
  Inconsistent Relationships: There may be conflicting definitions of relationships between the same entities in different parts of the model.
  Missing or Incorrect Configuration: The configuration of the entities or relationships may be incomplete or incorrect.
  
  Solution:
  To resolve the USMD1049 error, follow these steps:
  
  
  Review the Data Model: Check the data model for the specified entity type and relationship. Ensure that the cardinality defined for the relationship is appropriate for the business logic and data requirements.
  
  
  Validate Relationships: Ensure that the relationships between the entities are correctly defined. For example, if you have a one-to-many relationship, ensure that the "one" side can indeed relate to multiple instances on the "many" side.
  
  
  Check for Conflicts: Look for any conflicting definitions of the same relationship in other parts of the data model. Ensure that all definitions are consistent.
  
  
  Adjust Cardinality: If the cardinality is indeed incorrect, modify it to reflect the correct relationship. This may involve changing the cardinality type or adjusting the entities involved.
  
  
  Test Changes: After making adjustments, test the data model to ensure that the error is resolved and that the relationships function as expected.
  
  
  Consult Documentation: If you are unsure about the correct cardinality or how to define relationships, refer to SAP documentation or guidelines related to data modeling in MDG.
  
  
  Related Information:
  
  SAP MDG Documentation: Review the official SAP documentation for Master Data Governance, which provides guidelines on data modeling and relationship definitions.
  SAP Community: Engage with the SAP Community forums to seek advice from other users who may have encountered similar issues.
  SAP Notes: Check for any relevant SAP Notes that may address known issues or provide additional guidance on this error message.
  
  By following these steps, you should be able to identify and correct the cause of the USMD1049 error in your SAP environment.