How To Fix TW018 - Internal error at commline (INPUT)

SAP Error Message - Details

• Message type: E = Error

• Message class: TW - R3trans - Messages

• Message number: 018

• Message text: Internal error at commline (INPUT)

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 TW018 - Internal error at commline (INPUT) ?

  The SAP error message TW018, which states "Internal error at commline (INPUT)," typically indicates an issue with the communication line or the input parameters being processed by the system. This error can arise from various underlying causes, including configuration issues, data inconsistencies, or problems with the communication setup.
  Possible Causes:
  
  Configuration Issues: Incorrect settings in the communication configuration can lead to this error. This includes settings related to RFC (Remote Function Call) connections or other communication parameters.
  Data Inconsistencies: If the data being processed is inconsistent or corrupted, it may trigger this error. This can happen if there are issues with the data being sent or received.
  Network Problems: Issues with the network connection between the SAP system and external systems can also lead to communication errors.
  System Bugs: There may be bugs in the SAP system or specific transactions that can cause this error to occur.
  
  Solutions:
  
  Check Configuration: Review the communication configuration settings in the SAP system. Ensure that all parameters are correctly set up, including RFC destinations and communication protocols.
  Validate Data: Check the data being processed for any inconsistencies or corruption. Ensure that the input data meets the expected format and requirements.
  Network Diagnostics: Perform network diagnostics to ensure that there are no connectivity issues between the SAP system and any external systems it communicates with.
  SAP Notes: Search for relevant SAP Notes in the SAP Support Portal. There may be specific patches or updates that address this error.
  System Logs: Check the system logs (transaction SM21) for any additional error messages or warnings that may provide more context about the issue.
  Contact SAP Support: If the issue persists after trying the above solutions, consider reaching out to SAP Support for further assistance. Provide them with detailed information about the error, including any relevant logs and the context in which the error occurs.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as SM21 (System Log), ST22 (Dump Analysis), and SM37 (Job Monitoring) to help diagnose the issue.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they found effective.
  Documentation: Review SAP documentation related to communication and RFC settings for best practices and troubleshooting steps.
  
  By following these steps, you should be able to identify and resolve the underlying cause of the TW018 error in your SAP system.