How To Fix MC756 - Field &-& from join condition does not exist

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 756

• Message text: Field &-& from join condition does not exist

What causes this issue?

A join condition refers to a field which does not exist.

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?

You should only define existing fields of the base tables for join
conditions.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message MC756 - Field &-& from join condition does not exist ?

  The SAP error message MC756 ("Field &-& from join condition does not exist") typically occurs in the context of SAP's Material Management (MM) or other modules that involve data extraction and reporting, particularly when working with InfoObjects, DataSources, or queries in SAP BW (Business Warehouse).
  Cause:
  This error usually arises due to one of the following reasons:
  
  
  Field Mismatch: The field specified in the join condition does not exist in the underlying data source or InfoObject. This could be due to a typo, a field that has been removed, or a field that has not been activated.
  
  
  DataSource Changes: If the DataSource has been modified (e.g., fields added or removed) after the query or report was created, it may lead to this error.
  
  
  Incorrect Join Conditions: The join condition specified in the query or report may reference fields that are not part of the tables being joined.
  
  
  Transport Issues: If the query or report was transported from one system to another, there may be inconsistencies in the data model or InfoObjects.
  
  
  Solution:
  To resolve the MC756 error, you can follow these steps:
  
  
  Check Field Existence:
  
  Verify that the field mentioned in the error message exists in the DataSource or InfoObject. You can do this by checking the DataSource definition in the SAP BW system.
  
  
  
  Review Join Conditions:
  
  Go to the query or report definition and review the join conditions. Ensure that all fields referenced in the join conditions are valid and exist in the respective tables.
  
  
  
  Re-activate DataSource:
  
  If there have been changes to the DataSource, try reactivating it. This can sometimes resolve issues related to field availability.
  
  
  
  Update Query:
  
  If the DataSource has changed, you may need to update the query to reflect the new structure. This may involve removing or replacing fields that are no longer valid.
  
  
  
  Check Transport Logs:
  
  If the issue arose after a transport, check the transport logs for any errors or warnings that may indicate problems with the DataSource or InfoObjects.
  
  
  
  Consult Documentation:
  
  Review any relevant documentation or notes from SAP regarding the specific DataSource or InfoObject to ensure that you are using it correctly.
  
  
  
  Testing:
  
  After making changes, test the query or report to ensure that the error has been resolved.
  
  
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any known issues or patches related to the specific DataSource or InfoObject you are working with.
  Transaction Codes: Use transaction codes like RSA1 (Data Warehousing Workbench) to manage DataSources and InfoObjects, and RSRT (Query Monitor) to test queries.
  Documentation: Refer to SAP Help documentation for detailed information on DataSources, InfoObjects, and query design.
  
  If the issue persists after following these steps, it may be beneficial to consult with your SAP Basis or BW team for further assistance.