How To Fix >REP018 - Structure of selection &1 is not allowed

>REP018 - Overview

• Message type: E = Error

• Message class: >REP -

• Message number: 018

• Message text: Structure of selection &1 is not allowed

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

Unfortunately, there isn't any extra information in this error notice.

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>REP018 - Details

• The SAP error message REP018: Structure of selection &1 is not allowed typically occurs when there is an issue with the selection criteria defined in a report or transaction. This error indicates that the structure of the selection screen or the parameters being used are not compatible with the expected format or requirements of the report.
  Causes:
  
  Invalid Selection Criteria: The selection criteria defined in the report may not match the expected structure or format. This can happen if the fields used in the selection screen are not compatible with the data being queried.
  Incorrect Data Types: The data types of the fields in the selection criteria may not align with the data types in the underlying database tables.
  Missing or Incorrect Parameters: Required parameters may be missing or incorrectly defined, leading to an invalid selection structure.
  Custom Development Issues: If the report is a custom development, there may be issues in the ABAP code