How To Fix AQ509 - Fields with the index & cannot be linked

AQ509 - Overview

• Message type: E = Error

• Message class: AQ - Message texts for SAP Query

• Message number: 509

• Message text: Fields with the index & cannot be linked

What causes this issue?

In a link condition of a table join, you can define an equality
relationship between two fields only if the fields satisfy the
following conditions:

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

They belong to the same domain in the Dictionary or
They have the same Dictionary data type, including the same number of
characters and, if applicable, the same number of decimal places

System Response

How to fix this error?

Use the <PF>Field documentation</> function to find out the attributes
of the fields and then use the search functions to find a suitable
field.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message AQ509 - Fields with the index & cannot be linked ?

  The SAP error message AQ509, which states "Fields with the index & cannot be linked," typically occurs in the context of data modeling or when working with database indexes in SAP. This error indicates that there is an issue with linking fields in a way that is not supported by the underlying database structure or the way the data model is defined.
  Causes:
  
  Incompatible Data Types: The fields you are trying to link may have incompatible data types. For example, trying to link a character field with a numeric field.
  Index Definition Issues: The index defined for the fields may not support the linking operation you are attempting. This can happen if the index is not properly defined or if it does not include the necessary fields.
  Field Properties: The properties of the fields (like length, decimal places, etc.) may not match, leading to issues when trying to link them.
  Database Constraints: There may be