Message type: E = Error
Message class:  KU - Costing: Rollup 
Message number: 999
Message text: & & & &
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 "KU999" is a generic error message that typically indicates an issue with the configuration or processing of a particular transaction or function within SAP. The specific details of the error can vary based on the context in which it occurs, so it's important to gather more information about the situation in which the error is encountered. Possible Causes:
Configuration Issues: There may be a problem with the configuration settings in the system, such as missing or incorrect entries in customizing tables. Data Issues: The error could be caused by invalid or incomplete data being processed in the transaction. Authorization Problems: The user may not have the necessary authorizations to perform the action that triggered the error. System Bugs: There may be a bug in the SAP system or a specific transaction that is causing the error to be raised. Solutions: Check Configuration: Review the configuration settings related to the transaction or function where
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
KU454 No controlling area exists
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
KU453 & & objects for projects were selected
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
KV000 ************** General (001-149) ****************************************
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
KV001 Controlling area & does not exist
What causes this issue?  <DS:GLOS.controlling_area>Controlling area</> &V1& does not exist in the system.System Response  Further ...
Click on this link to search all SAP messages.