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

USMD1049 - Overview

• 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