Message type: E = Error
Message class:  FKKINV - Invoicing in Contract Accounts Receivable and Payable 
Message number: 098
Message text: Billing reversal using business partner only possible in dialog
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.
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.
The SAP error message FKKINV098 indicates that a billing reversal using a business partner is only possible in dialog mode. This error typically occurs in the context of the SAP Convergent Charging or SAP Contract Accounts Receivable and Payable (FI-CA) modules when trying to reverse a billing document through a background job or program instead of the dialog interface.
Cause: The primary cause of this error is that the system is designed to require user interaction (dialog mode) for certain operations, such as billing reversals. This is likely due to the need for confirmation or additional input from the user to ensure that the reversal is intentional and correctly processed.
Solution: To resolve this error, you should perform the billing reversal in dialog mode rather than attempting to execute it in the background. Here are the steps to do this: Access the Transaction: Go to the appropriate transaction code for billing reversal (e.g., FPL9 for
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
FKKINV097 No billing documents selected for reversal
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
FKKINV096 Subapplication &1 is unknown
What causes this issue?  The <DS:DE.SUBAP_KK>Subapplication</> &v1& is unknown.System Response  The system issues an error message...
FKKINV099 Choose a contract account for business partner &1
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
FKKINV100 --------Messages 100-199 reserved for invoicing------------------
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
Click on this link to search all SAP messages.