Message type: E = Error
Message class:  CNV_OM_PRESEL - Messages for LT Object Based Preselection 
Message number: 302
Message text: Remote system failure: &1
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 CNV_OM_PRESEL302 Remote system failure: &1 typically occurs during data migration or system conversion processes, particularly when using the SAP S/4HANA Migration Cockpit or similar tools. This error indicates that there was a failure in communication with a remote system, which could be due to various reasons. Possible Causes: Network Issues: There may be connectivity problems between the SAP system and the remote system. Authorization Issues: The user or service account may not have the necessary permissions to access the remote system. Configuration Errors: Incorrect configuration settings in the RFC (Remote Function Call) destination or in the connection parameters. Remote System Down: The remote system may be down or not reachable at the time of the operation. Timeouts: The operation may be timing out due to long processing times or heavy load on the remote system. Data Format Issues: The data being sent to the remote system may not be in the expected format,
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
CNV_OM_PRESEL301 No authority to schedule preselection tasks in sender system.
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_OM_PRESEL300 Error when scheduling preselection tasks.
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_OM_PRESEL303 Communication failure: &1
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_OM_PRESEL304 Unexpected error when scheduling preselection tasks.
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.