Message type: E = Error
Message class:  CNV_CMIS_G - CMIS: general messages 
Message number: 074
Message text: There is already a data backup record for the specified parameters.
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_G074 indicates that there is already a data backup record for the specified parameters in the context of a data migration or conversion process. This error typically arises when you attempt to create a new backup for data that has already been backed up with the same parameters.
Cause: Duplicate Backup Attempt: The most common cause is that a backup operation is being attempted for data that has already been backed up with the same criteria (e.g., same object, same date, etc.). Incorrect Parameters: The parameters specified for the backup may not be unique or may have been reused inadvertently. System Configuration: There may be a configuration issue in the data migration tool or the system that is causing it to not recognize existing backups correctly.
Solution: Check Existing Backups: Review the existing backup records in the system to confirm that a backup already exists for the specified parameters. You can usually
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
CNV_CMIS_G073 No table for backup found. Please check.
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_G072 The activity &1 has been deleted from the phase &2
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_G075 Reservation not sufficient for data.
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_G076 Jobs are scheduled in the background.
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.