How To Fix E2234 - Foreign key &-& can only be changed in the referenced type

E2234 - Overview

• Message type: E = Error

• Message class: E2 - DE Data Dictionary

• Message number: 234

• Message text: Foreign key &-& can only be changed in the referenced type

What causes this issue?

You wanted to create or change a foreign key for an expanded field.

System Response

The foreign key for an expanded field is only displayed, but cannot be
changed.

How to fix this error?

Change the foreign key in the referenced type itself. The change also
affects the structures or tables that use this type.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message E2234 - Foreign key &-& can only be changed in the referenced type ?

  The SAP error message E2234, which states "Foreign key &-& can only be changed in the referenced type," typically occurs when you are trying to modify a foreign key relationship in a way that is not allowed by the system. This error is related to the integrity of the data model in SAP, particularly in the context of database tables and their relationships.
  
  Cause:
  
  Foreign Key Constraint: The error arises when you attempt to change a foreign key field in a table that references another table. The foreign key constraint ensures that the relationship between the two tables remains intact.
  Modification Attempt: You might be trying to change the foreign key field in the child table instead of the parent table (the referenced type). In SAP, changes to foreign key relationships must be made in the table that defines the primary key (the referenced type).
  Data Integrity: SAP enforces data integrity rules to prevent