How To Fix UD646 - Unbundling of the relationships was switched on

UD646 - Overview

• Message type: E = Error

• Message class: UD - EDM - Enterprise Data Model

• Message number: 646

• Message text: Unbundling of the relationships was switched on

What causes this issue?

The semantic attributes of the foreign key relationships are symbolized
by different entries and by arrows with this setting. The
representation corresponds to that for relationships in the SAP data
model.
Unbundling relationships:
Entry from the left:
* Relationships of type KEY ( foreign key fields are specified as
key fields/candidates )
* Relationships of type TXT ( foreign key fields are specified as
key fields of a text table )
Entry from above/below:
* Relationships of type REF ( foreign key fields are specified as
non-key fields/candidates )
* Relationships whose foreign key fields are not specified
Arrows:
The arrows symbolize the right cardinality:
* single arrow: cardinality 1
* single arrow with vertical line: cardinality C
* double arrow: cardinality N
* double arrow with vertical line: cardinality CN
* no arrow: cardinality not speicified
The text for the left cardinality is displayed on the relationship line
if it is not equal to 1.

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 UD646 - Unbundling of the relationships was switched on ?

  The SAP error message UD646, which states "Unbundling of the relationships was switched on," typically occurs in the context of SAP's handling of master data relationships, particularly in the areas of materials management or product lifecycle management. This error indicates that the system is trying to process a relationship that has been configured to allow unbundling, but the operation cannot be completed due to certain constraints or settings.
  
  Cause:
  
  Unbundling Configuration: The error is triggered when the unbundling feature is enabled for a specific relationship type, but the system encounters a situation where it cannot unbundle the relationships as expected.
  Data Integrity Issues: There may be inconsistencies or missing data in the master records that prevent the unbundling process from completing successfully.
  Business Logic Constraints: Certain business rules or logic may restrict the unbundling of relationships based on the current state of the data.
  
  
  Solution:
  
  Check Configuration: Review the configuration settings for the unbundling feature in