How To Fix FL398 - With RFC, table types with secondary keys are not allowed

FL398 - Overview

• Message type: E = Error

• Message class: FL - Function Builder messages

• Message number: 398

• Message text: With RFC, table types with secondary keys are 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.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

FL398 - Details

• The SAP error message FL398 ("With RFC, table types with secondary keys are not allowed") typically occurs when you are trying to use a table type that has secondary keys in a Remote Function Call (RFC) context. In SAP, RFCs are used to call functions in a different SAP system or in a different session, and certain restrictions apply to the data structures that can be passed between systems.
  
  Cause:
  The error arises because:
  
  The table type you are trying to use in your RFC-enabled function module has secondary keys defined.
  RFC does not support table types with secondary keys, as it can lead to inconsistencies and complications in data handling.
  
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Modify the Table Type:
  
  Change the definition of the table type to remove any secondary keys. You can do this by:
  Going to the Data Dictionary (transaction SE11).
  Finding the table type in question.
  Editing the table type to