How To Fix DI798 - Parameter field &-& for lock parameter & is not a key field

SAP Error Message - Details

• Message type: E = Error

• Message class: DI - Dictionary messages: Indexes

• Message number: 798

• Message text: Parameter field &-& for lock parameter & is not a 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.
Non-key fields can be used for this if the lock object has only one
base table, which is a structure without key fields.
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?

If the lock object has only one basis table which is a structure, check
whether this structure still has unwanted key fields. Otherwise delete
the lock parameter or define the whole field as a key field.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message DI798 - Parameter field &-& for lock parameter & is not a key field ?

  The SAP error message DI798 indicates that there is an issue with a parameter field that is being used in a lock mechanism. Specifically, the error states that the parameter field specified is not a key field for the lock parameter being referenced. This typically occurs in the context of data locking in SAP, where certain fields are expected to be key fields for the locking mechanism to work correctly.
  Cause:
  
  Non-Key Field Usage: The error arises when a field that is not defined as a key field in the database table is being used in a locking operation. Locking mechanisms in SAP require that the fields used for locking must be key fields to ensure data integrity and consistency.
  Incorrect Configuration: There may be a configuration issue where the wrong field is being referenced in the locking logic.
  Custom Development: If there is custom code (e.g., ABAP programs, function modules) that is trying to lock records using non-key fields, this error can occur.
  
  Solution:
  
  Check Field Definitions: Verify that the field being used for locking is indeed a key field in the relevant database table. You can do this by checking the table definition in the Data Dictionary (transaction SE11).
  Modify Locking Logic: If the field is not a key field, you will need to modify the locking logic in your code to use a valid key field instead. This may involve changing the parameters passed to the locking function or method.
  Review Custom Code: If the error is occurring in custom ABAP code, review the code to ensure that it adheres to the locking requirements. Make sure that only key fields are used in the locking statements.
  Consult Documentation: If you are unsure about the key fields for a specific table, refer to the SAP documentation or consult with a functional consultant who is familiar with the data model.
  
  Related Information:
  
  Transaction Codes: You can use transaction codes like SE11 (Data Dictionary) to check table definitions and SE80 (Object Navigator) to review custom code.
  SAP Notes: Check for any relevant SAP Notes that might address this specific error or provide additional guidance.
  Locking Mechanisms: Familiarize yourself with SAP's locking mechanisms, including how to use the ENQUEUE and DEQUEUE function modules correctly.
  
  By addressing the root cause of the error and ensuring that the correct key fields are used in locking operations, you should be able to resolve the DI798 error effectively.