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

SAP Error Message - Details

• 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.

Smart SAP Assistant

• What is the cause and solution for SAP error message FL398 - With RFC, table types with secondary keys are not allowed ?

  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 remove secondary keys, ensuring that it only has a primary key.
  
  
  
  
  
  Use a Different Data Structure:
  
  If you need to maintain secondary keys for your application logic, consider using a different data structure that does not require secondary keys when being passed via RFC. For example, you could use a standard internal table without secondary keys.
  
  
  
  Check Function Module Definition:
  
  Ensure that the function module you are using is correctly defined as RFC-enabled. You can check this in transaction SE37 by looking at the attributes of the function module.
  
  
  
  Testing:
  
  After making the necessary changes, test the RFC call again to ensure that the error is resolved.
  
  
  
  Related Information:
  
  RFC Function Modules: When creating RFC-enabled function modules, it is important to adhere to the limitations and guidelines provided by SAP regarding data types and structures.
  Data Dictionary (SE11): This transaction is used to manage database objects, including table types, and is where you can modify the structure of your table types.
  SAP Documentation: For more detailed information, refer to the official SAP documentation or help portal, which provides guidelines on RFC programming and data types.
  
  By following these steps, you should be able to resolve the FL398 error and successfully use your function module in an RFC context.