Message type: E = Error
Message class:  CNV_OM_PRESEL - Messages for LT Object Based Preselection 
Message number: 140
Message text: The following tasks are not ready to be started
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_PRESEL140 typically occurs during the execution of a conversion or migration project, particularly when using the SAP S/4HANA Migration Cockpit or similar tools. This error indicates that certain tasks required for the migration process are not ready to be started, which can halt the entire migration process. Causes: Incomplete Pre-requisites: The tasks that are not ready may have dependencies that have not been fulfilled. This could include missing configuration settings, incomplete data preparation, or unexecuted prior tasks. Data Issues: There may be issues with the data that needs to be migrated, such as inconsistencies, missing records, or data that does not meet the required format. System Configuration: The system may not be properly configured for the migration process, including missing authorizations or incorrect settings in the migration cockpit. Task Status: The status of the tasks may not be updated correctly, leading to the system believing that they are not ready. Solutions: Check Task
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
CNV_OM_PRESEL139 The following tasks have been selected to be started
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_PRESEL138 Task: &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_PRESEL141 None of the selected tasks is ready, thus nothing happens.
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_PRESEL142 The following tasks and their successors have been selected to be started
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.