How To Fix EPROD052 - Foreign keys cannot be specified for key fields

SAP Error Message - Details

• Message type: E = Error

• Message class: EPROD - Messages for IS-U Master Data Templates

• Message number: 052

• Message text: Foreign keys cannot be specified for key fields

What causes this issue?

In the case of attribute to which an <DS:DE.EPD_FKEY_TYPEID>external
key template category</> and external key attribute are allocated, the
<DS:DE.EPD_KEYATTR>key attribute</> field cannot be set.

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?

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 EPROD052 - Foreign keys cannot be specified for key fields ?

  The SAP error message EPROD052, which states "Foreign keys cannot be specified for key fields," typically occurs in the context of defining database tables or structures in the Data Dictionary (SE11) or while working with ABAP Dictionary objects. This error indicates that there is an attempt to define a foreign key relationship on a field that is already a key field in the table.
  Cause:
  
  Key Field Definition: The field you are trying to set as a foreign key is already defined as a key field in the table. In SAP, key fields are used to uniquely identify records in a table, and foreign keys are used to establish relationships between tables.
  Incorrect Foreign Key Assignment: You may be trying to create a foreign key relationship on a field that is not suitable for such a relationship due to its status as a key field.
  
  Solution:
  
  Review Key Field Definitions: Check the definition of the table or structure where the error occurs. Ensure that you are not trying to define a foreign key on a field that is already a key field.
  Adjust Foreign Key Relationships: If you need to establish a foreign key relationship, consider using a non-key field for the foreign key definition. This means you should select a field that does not have the key attribute.
  Modify Table Structure: If necessary, you may need to modify the table structure to accommodate the foreign key relationship. This could involve changing which fields are designated as key fields or creating additional fields to serve as foreign keys.
  Check Data Dictionary: Use transaction SE11 to review the Data Dictionary and ensure that the relationships and definitions are correctly set up.
  
  Related Information:
  
  Data Dictionary (SE11): This is the primary tool for managing database objects in SAP. You can use it to view and modify table definitions, including key fields and foreign keys.
  ABAP Dictionary: Understanding how the ABAP Dictionary works can help you better manage relationships between tables and structures.
  SAP Documentation: Refer to SAP Help documentation for detailed guidelines on defining tables, key fields, and foreign keys.
  
  If you continue to face issues after following these steps, consider reaching out to your SAP Basis or ABAP development team for further assistance, as they may have additional insights based on your specific system configuration.