How To Fix SDDL_PARSER_MSG257 - Two target fields cannot be compared in the composition definition

SAP Error Message - Details

• Message type: E = Error

• Message class: SDDL_PARSER_MSG - Message Class for DDL Parser

• Message number: 257

• Message text: Two target fields cannot be compared in the composition definition

What causes this issue?

It is not possible to compare two fields of the child entity in the ON
condition of a composition definition.

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 comparison must contain a key field of the parent entity.

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 SDDL_PARSER_MSG257 - Two target fields cannot be compared in the composition definition ?

  The SAP error message SDDL_PARSER_MSG257 indicates that there is an issue with the composition definition in your SAP system, specifically that two target fields cannot be compared. This typically occurs in the context of data modeling or when defining relationships between different data elements in SAP.
  
  Cause:
  The error usually arises due to one of the following reasons:
  
  Incompatible Data Types: The two target fields you are trying to compare may have incompatible data types. For example, one field might be a string while the other is a numeric type.
  Field Length Mismatch: The lengths of the fields being compared may not match, which can lead to issues during comparison.
  Incorrect Field Mapping: There may be a mistake in how the fields are mapped in the composition definition, leading to an invalid comparison.
  Missing or Incorrect Metadata: The metadata for the fields may not be correctly defined, causing the system to be unable to interpret the