Message type: E = Error
Message class:  CNVHCM_PRESEL - TDMS4HCM: Messages for Object Selection 
Message number: 154
Message text: Specify some objects to start with in the first step
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 CNVHCM_PRESEL154 typically occurs during the data migration process, particularly when using the SAP Landscape Transformation (SLT) or SAP Data Services for migrating data to SAP S/4HANA or other SAP systems. This error indicates that the system requires you to specify certain objects (like infotypes, tables, or other data structures) to begin the migration process.
Cause: The error arises when the migration process is initiated without defining the necessary objects that need to be processed. This can happen due to: Missing Object Selection: The user has not selected any objects to migrate.
Configuration Issues: The configuration settings for the migration process may not have been set up correctly. User Permissions: The user may not have the necessary permissions to select or view the objects.
Solution: To resolve the CNVHCM_PRESEL154 error, follow these steps: Select Objects: Go back to the initial step of the migration process and ensure that you select the appropriate objects (like infotypes or
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
CNVHCM_PRESEL153 Do not self-reference selection ID; specify different ID in step &1
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNVHCM_PRESEL152 Specify a plan version for step &1
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNVHCM_PRESEL155 Specify at least one step for the criteria
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNVHCM_PRESEL156 Circular reference through ID &1; specify different ID in step &2
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.