How To Fix DI799 - Parameter field &-& for lock parameter & is a foreign key field

SAP Error Message - Details

• Message type: E = Error

• Message class: DI - Dictionary messages: Indexes

• Message number: 799

• Message text: Parameter field &-& for lock parameter & is a foreign key field

What causes this issue?

A <DS:TX.DDDOK_ENQU_PARAMETER>lock parameter</> of a lock object must
always be assigned to a <DS:TX.DDDOK_ENQU_PARAMETERFIELD>parameter
field</> of the lock object. Fields which occur in one of the join
conditions of the lock object are not eligible.
A field was assigned to the lock parameter named which does not conform
to this requirement.

System Response

The action was cancelled.

How to fix this error?

Change the join conditions of the lock object or delete the lock
parameter named. In the second case, ensure first that this parameter
is not used in any call to the lock modules belonging to the lock
object.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message DI799 - Parameter field &-& for lock parameter & is a foreign key field ?

  The SAP error message DI799 indicates that there is an issue with a parameter field that is defined as a foreign key in the context of a lock parameter. This typically occurs in scenarios where you are trying to lock a record in a database table, but the field you are using as a lock parameter is a foreign key field, which is not allowed in certain locking mechanisms.
  Cause:
  
  Foreign Key Constraint: The field you are trying to use as a lock parameter is defined as a foreign key in the database. Foreign key fields are typically used to establish relationships between tables, and locking them directly can lead to inconsistencies in data integrity.
  Locking Mechanism: The locking mechanism in SAP may not support locking on foreign key fields due to the way data integrity is maintained across related tables.
  
  Solution:
  
  Change Lock Parameter: Instead of using the foreign key field as a lock parameter, consider using a different field that is not a foreign key. This could be a primary key or another unique identifier that does not have foreign key constraints.
  Review Data Model: Review the data model to understand the relationships and constraints. Ensure that the fields you are using for locking are appropriate and do not violate any foreign key constraints.
  Modify Code: If you are working with custom code (e.g., ABAP), modify the code to use a valid lock parameter. Ensure that the logic for locking records is aligned with the database design.
  Consult Documentation: Refer to SAP documentation or help resources for specific guidelines on locking mechanisms and foreign key constraints.
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any specific fixes or recommendations related to this error message. SAP frequently updates its knowledge base with solutions to common issues.
  Transaction Codes: Familiarize yourself with transaction codes related to database management and locking, such as SE11 (Data Dictionary) and SE80 (Object Navigator).
  Testing: After making changes, thoroughly test the application to ensure that the locking mechanism works as intended and that data integrity is maintained.
  
  If the issue persists after trying the above solutions, consider reaching out to SAP support or consulting with a technical expert who specializes in SAP database management and ABAP programming.