How To Fix MC766 - Key field & of primary table & missing

SAP Error Message - Details

• Message type: E = Error

• Message class: MC - Aggregate: views, matchcodes, lock objects

• Message number: 766

• Message text: Key field & of primary table & missing

What causes this issue?

Not all of the key fields of the primary table (other than clients)
were included in a help view.

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?

To be able to use a help view in a sensible manner as selection method
for a search help, it should contain all the key fields of the primary
table. Include the missing key fields in the view.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message MC766 - Key field & of primary table & missing ?

  The SAP error message MC766 ("Key field & of primary table & missing") typically occurs in the context of Material Management (MM) or Logistics Information System (LIS) when there is an issue with the data being processed in a report or transaction. This error indicates that a required key field in a primary table is missing, which prevents the system from retrieving or processing the necessary data.
  Causes:
  
  Missing Data: The key field that the system expects to find in the primary table is not populated. This could be due to incomplete data entry or data corruption.
  Configuration Issues: There may be issues with the configuration of the data model or the InfoObject in the data warehouse.
  Data Extraction Problems: If the data is being extracted from a source system, there may be issues with the extraction process that lead to missing key fields.
  Custom Development: If there are custom reports or programs, they may not be handling the data correctly, leading to missing key fields.
  
  Solutions:
  
  Check Data Completeness: Verify that all required fields in the relevant tables are populated. You can do this by running a report or transaction that checks for missing data.
  Review Configuration: Ensure that the configuration for the relevant InfoObjects or data models is correct. This may involve checking settings in the SAP BW or LIS.
  Data Extraction: If the issue is related to data extraction, review the extraction process to ensure that all necessary fields are being extracted correctly.
  Debug Custom Code: If the error arises from a custom report or program, debug the code to identify where the key field is being referenced and why it is missing.
  Consult Documentation: Review SAP documentation or notes related to the specific transaction or report to see if there are known issues or additional configuration steps required.
  
  Related Information:
  
  Transaction Codes: Depending on where the error occurs, you may want to check transactions like MC.9 (for LIS) or MB51 (for material documents) to see if the data is available.
  SAP Notes: Search for relevant SAP Notes in the SAP Support Portal that may address this specific error message or provide additional troubleshooting steps.
  Data Dictionary: Use transaction SE11 to check the structure of the relevant tables and identify which key fields are required.
  User Exits and BAdIs: If custom logic is involved, check for any user exits or BAdIs that may be affecting data processing.
  
  By following these steps, you should be able to identify the root cause of the MC766 error and implement a solution to resolve it.