How To Fix MC812 - Field &-&: Join condition for type & is not allowed

MC812 - Overview

• Message type: E = Error

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

• Message number: 812

• Message text: Field &-&: Join condition for type & is not allowed

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message MC812 - Field &-&: Join condition for type & is not allowed ?

  The SAP error message MC812, which states "Field &-&: Join condition for type & is not allowed," 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.
  
  Cause:
  This error usually arises due to one of the following reasons:
  
  
  Invalid Join Condition: The join condition specified in the query or data extraction is not valid for the type of data being processed. This can happen if you are trying to join fields that are not compatible or if the join condition does not meet the requirements of the underlying data model.
  
  
  Data Model Issues: There may be issues with the data model itself, such as incorrect relationships between InfoObjects or data sources that do not support the specified join.
  
  
  Field Type Mismatch: The fields being joined may have different data types or characteristics that prevent them from being