How To Fix MC737 - Invalid type in join &-& = &-&

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 737

• Message text: Invalid type in join &-& = &-&

What causes this issue?

The field type does not permit you to define a join condition.
Types for which a join condition cannot be defined are LRAW and LCHR.

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?

The view cannot be defined in this way.

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 MC737 - Invalid type in join &-& = &-& ?

  The SAP error message MC737 "Invalid type in join &-& = &-&" typically occurs in the context of SAP's reporting and data extraction processes, particularly when working with queries or reports that involve joins between different data tables. This error indicates that there is a mismatch in the data types of the fields being joined.
  Cause:
  
  Data Type Mismatch: The most common cause of this error is that the fields being joined have incompatible data types. For example, trying to join a character field with a numeric field.
  Incorrect Field Selection: Sometimes, the fields selected for the join may not be appropriate for the join condition, leading to this error.
  Database Schema Changes: If there have been changes in the underlying database schema (like changes in data types or field definitions), it can lead to this error.
  Custom Code or Queries: If you are using custom ABAP code or queries, there might be an issue in how the joins are defined.
  
  Solution:
  
  Check Data Types: Verify 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) for the relevant tables.
  Modify the Join Condition: If you find that the data types are incompatible, you may need to modify the join condition to ensure that both fields are of the same type. This might involve casting one of the fields to match the other.
  Review Query/Report Logic: If you are using a query or report, review the logic to ensure that the correct fields are being used for the join.
  Check for Schema Changes: If there have been recent changes to the database schema, ensure that your queries or reports are updated accordingly.
  Debugging: If you are using custom ABAP code, consider debugging the code to identify where the error is occurring and what the data types of the fields are at runtime.
  
  Related Information:
  
  Transaction Codes: You can use transaction codes like SE11 (Data Dictionary), SE80 (Object Navigator), or SQ01/SQ02 (SAP Query) to investigate the tables and queries involved.
  SAP Notes: Check the SAP Support Portal for any relevant SAP Notes that might address this specific error or provide additional guidance.
  Documentation: Review SAP documentation related to data types and joins in ABAP or the specific module you are working with.
  
  If the issue persists after trying the above solutions, consider reaching out to your SAP Basis or ABAP development team for further assistance.