How To Fix MC764 - Type conflict in join &-& = &-&

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 764

• Message text: Type conflict in join &-& = &-&

What causes this issue?

Two fields with different data types or lengths are elements of a join.
Such conditions normally do not make sense.

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

System Response

This is only a warning message.

How to fix this error?

Check in your own developments whether the join condition was defined
in this way on purpose.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message MC764 - Type conflict in join &-& = &-& ?

  The SAP error message MC764, which states "Type conflict in join &-& = &-&", typically occurs in the context of data extraction or reporting, particularly when working with InfoObjects in SAP BW (Business Warehouse) or when creating queries in SAP Query Designer. This error indicates that there is a type mismatch between the fields being joined in a query or data model.
  Cause:
  
  Data Type Mismatch: The most common cause of this error is that the fields being joined have different data types. For example, one field might be a character type (CHAR) while the other is a numeric type (NUMC).
  Inconsistent Field Definitions: If the fields involved in the join are defined differently in the underlying data sources (e.g., different lengths, formats, or types), this can lead to conflicts.
  Incorrect Join Conditions: The join conditions specified in the query or data model may not be valid due to the type differences.
  
  Solution:
  
  Check Data Types: Review the data types of the fields involved in the join. Ensure that they are compatible. You can do this by checking the data dictionary (SE11) or the InfoObject definitions in SAP BW.
  Modify Query or Data Model: If you find that the data types are indeed different, you may need to modify the query or data model to ensure that the fields being joined are of the same type. This could involve:
  
  Changing the data type of one of the fields (if feasible).
  Using a conversion function in the query to convert one field to match the type of the other.
  
  
  Review Join Conditions: Ensure that the join conditions are correctly defined and that they logically make sense given the data types of the fields.
  Test with Sample Data: After making changes, test the query or data model with sample data to ensure that the error is resolved.
  
  Related Information:
  
  Transaction Codes: You may use transaction codes like SE11 (Data Dictionary), SE80 (Object Navigator), or RSA1 (Data Warehousing Workbench) to investigate the definitions of the InfoObjects and the underlying data sources.
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message. Sometimes, specific versions of SAP BW may have bugs that are documented in SAP Notes.
  Documentation: Refer to SAP documentation for best practices on data modeling and query design to avoid type conflicts in the future.
  
  By following these steps, you should be able to identify and resolve the type conflict causing the MC764 error in your SAP environment.