Message type: E = Error
Message class:  CNV_CMIS_A_20 - Message class for Cross-Client Customizing Comparison (SLO) 
Message number: 142
Message text: Start dates are invalid
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_CMIS_A_20142 indicates that there is an issue with the start dates in the context of a conversion or migration process, typically related to the SAP Conversion Management Information System (CMIS). This error usually arises when the start dates provided for certain processes or activities are either invalid or not in the expected format. Causes: Invalid Date Format: The date may not be in the correct format expected by the system (e.g., DD/MM/YYYY vs. MM/DD/YYYY). Out of Range Dates: The dates provided may fall outside the acceptable range defined by the system (e.g., dates in the future or too far in the past). Missing Dates: Required start dates may not have been provided, leading to the error. Data Consistency Issues: There may be inconsistencies in the data being migrated, such as overlapping dates or conflicting entries. Solutions: Check Date Format: Ensure that the start dates are in the correct format as required by the
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
CNV_CMIS_A_20141 Cannot Start Immediately
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_CMIS_A_20140 Error in internal number assignment
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_CMIS_A_20143 Job Name Missing (Wildcards Allowed)
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_CMIS_A_20144 Error During JOB_CLOSE
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.