How To Fix E2179 - Partial foreign key selected (select only one alternative)

SAP Error Message - Details

• Message type: E = Error

• Message class: E2 - DE Data Dictionary

• Message number: 179

• Message text: Partial foreign key selected (select only one alternative)

What causes this issue?

You marked the foreign key as a partial foreign key by setting the
<LS>Generic</> flag. However, there is not yet an entry in the
<LS>Constants</> column.
For partial foreign keys, the fields marked as generic are removed from
the assignment to the key fields of the check table. There is only a
check for the remaining fields.

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?

Remove the entry in the <LS>Constants</> column or reset the <ZH>
<ZH>generic</></> flag.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message E2179 - Partial foreign key selected (select only one alternative) ?

  The SAP error message E2179, "Partial foreign key selected (select only one alternative)," typically occurs in the context of database operations, particularly when dealing with foreign key relationships in SAP systems. This error indicates that the system has detected an attempt to select multiple records that are linked by a foreign key relationship, but the selection criteria do not uniquely identify a single record.
  Cause:
  
  Ambiguous Selection Criteria: The selection criteria used in the query or operation may not be specific enough to uniquely identify a single record in the database.
  Multiple Foreign Key Relationships: If there are multiple foreign key relationships defined, the system may be confused about which relationship to use for the selection.
  Incorrect Data Model: The underlying data model may not be properly defined, leading to ambiguity in foreign key relationships.
  
  Solution:
  
  Refine Selection Criteria: Ensure that the selection criteria used in your query or operation are specific enough to return a single record. This may involve adding additional filters or conditions to the selection.
  Check Foreign Key Relationships: Review the foreign key relationships defined in the data model to ensure they are correctly set up and that there are no ambiguities.
  Use Unique Identifiers: If possible, use unique identifiers (like primary keys) in your selection criteria to avoid ambiguity.
  Debugging: If you are working with ABAP code, use debugging tools to trace the execution and identify where the selection is failing.
  
  Related Information:
  
  SAP Documentation: Refer to the official SAP documentation for more details on foreign key relationships and how to manage them.
  Data Dictionary: Check the Data Dictionary (SE11) to review the table definitions and foreign key relationships.
  Transaction Codes: Use transaction codes like SE80 (Object Navigator) or SE11 (Data Dictionary) to analyze the database structure and relationships.
  Community Forums: Consider checking SAP community forums or support channels for similar issues and solutions shared by other users.
  
  By addressing the cause of the error and implementing the suggested solutions, you should be able to resolve the E2179 error in your SAP environment.