How To Fix DI800 - Foreign key field &-& for join of table & is not a key field

SAP Error Message - Details

• Message type: E = Error

• Message class: DI - Dictionary messages: Indexes

• Message number: 800

• Message text: Foreign key field &-& for join of table & is not a key field

What causes this issue?

Each secondary table of a lock object must be connected to a base table
above it in the hierarchy with a join condition. This join condition
must be implemented via a foreign key. This foreign key must have the
secondary table as foreign key table and the base table higher in the
hierarchy as check table. All foreign key fields which are in base
tables must also be key fields there.
This requirement is not met by the foreign key field named, which
belongs to the preceeding table of the join condition of the secondary
table named.

System Response

The action is cancelled.

How to fix this error?

Build the hierarchy of the lock object correctly. Observe the
<DS:TX.DDDOK_ENQU_REQUIREMENTS>requirements for the join conditions of
a lock object</>.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message DI800 - Foreign key field &-& for join of table & is not a key field ?

  The SAP error message DI800 indicates that there is an issue with a foreign key relationship in your data model, specifically that a foreign key field is not defined as a key field in the corresponding table. This error typically arises in the context of data integration or when working with data models in SAP systems, such as SAP BW (Business Warehouse) or SAP HANA.
  Cause:
  
  Foreign Key Definition: The foreign key field you are trying to use in a join operation is not defined as a key field in the target table. In relational databases, foreign keys must reference primary keys or unique keys in the related table.
  Data Model Configuration: There may be a misconfiguration in the data model where the foreign key relationship is not properly established.
  Table Structure Changes: If the structure of the table has changed (e.g., fields added or removed), it may lead to this error if the foreign key constraints are not updated accordingly.
  
  Solution:
  
  Check Table Definitions: Verify the definitions of the tables involved in the join. Ensure that the foreign key field is indeed defined as a key field in the target table.
  Modify Data Model: If the foreign key field is not a key field, you may need to modify the data model to either:
  
  Change the definition of the target table to include the foreign key field as a key field.
  Adjust the join condition to use a different field that is a key field in the target table.
  
  
  Update Data Source: If you are using a data source that has been modified, ensure that the data source is updated to reflect the current structure of the tables.
  Check for Data Integrity: Ensure that the data being loaded or processed maintains referential integrity, meaning that all foreign key values must correspond to existing key values in the related table.
  
  Related Information:
  
  SAP Documentation: Refer to the official SAP documentation for detailed information on foreign key relationships and data modeling best practices.
  Transaction Codes: Use transaction codes like SE11 (Data Dictionary) to check table definitions and relationships.
  Debugging: If you are still encountering issues, consider using debugging tools or logs to trace the exact point of failure in the data processing or loading steps.
  
  By addressing the foreign key relationship and ensuring that the data model is correctly configured, you should be able to resolve the DI800 error.