How To Fix AQQIS_CNTRL022 - Fields &1 and &2 cannot be connected

SAP Error Message - Details

• Message type: E = Error

• Message class: AQQIS_CNTRL - Join-Control InfoSet

• Message number: 022

• Message text: Fields &1 and &2 cannot be connected

What causes this issue?

The attempt at joining two fields failed.
This could be caused by the following:
No agreement in the technical properties of the fields (type, length,
decimal places).
The fields are already joined.
Field A from table A is already joined with another field C from table
B. For this reason, field A from table A can no longer be joined with
field B from table B.

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?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message AQQIS_CNTRL022 - Fields &1 and &2 cannot be connected ?

  The SAP error message AQQIS_CNTRL022, which states "Fields &1 and &2 cannot be connected," typically occurs in the context of data processing or integration within SAP systems, particularly when dealing with data sources, data models, or data connections in applications like SAP BW (Business Warehouse) or SAP HANA.
  Cause:
  This error usually arises due to one of the following reasons:
  
  
  Incompatible Data Types: The fields you are trying to connect or relate have incompatible data types. For example, one field might be a string while the other is a numeric type.
  
  
  Missing or Incorrect Mapping: There may be a missing mapping between the fields in the data model or transformation process, leading to an inability to establish a connection.
  
  
  Field Properties: The properties of the fields (like length, precision, or scale) may not match, causing the connection to fail.
  
  
  Data Source Issues: The data sources from which the fields are being pulled may not be properly configured or may not support the connection.
  
  
  Versioning Issues: If there are different versions of the data model or if the fields have been altered in a way that breaks the connection, this error can occur.
  
  
  Solution:
  To resolve the AQQIS_CNTRL022 error, you can take the following steps:
  
  
  Check Data Types: Verify that the data types of the fields you are trying to connect are compatible. If they are not, consider converting one of the fields to match the other.
  
  
  Review Field Mapping: Ensure that the fields are correctly mapped in your data model or transformation. If necessary, re-establish the mapping.
  
  
  Examine Field Properties: Check the properties of both fields (length, precision, etc.) to ensure they are compatible. Adjust them if needed.
  
  
  Validate Data Sources: Ensure that the data sources are correctly configured and that they support the connection you are trying to establish.
  
  
  Check for Updates: If you are working with a versioned data model, ensure that you are using the correct version and that all changes have been properly implemented.
  
  
  Consult Documentation: Refer to SAP documentation or support resources for specific guidance related to the error message and the context in which it occurs.
  
  
  Debugging: If the issue persists, consider using debugging tools within SAP to trace the error and identify the exact point of failure.
  
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered and resolved similar issues.
  Documentation: Review SAP documentation related to the specific module or application you are working with for additional insights.
  
  By following these steps, you should be able to identify the root cause of the AQQIS_CNTRL022 error and implement an appropriate solution.