Message type: E = Error
Message class:  CNV_CDMC_CA - CDMC Clearing Analysis 
Message number: 055
Message text: Invalid group name to initialize the parallel processing
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_CDMC_CA055 indicates that there is an issue with the group name used to initialize parallel processing in the context of a data conversion or migration project, typically related to the SAP Conversion Tools (like the SAP S/4HANA Migration Cockpit).
Cause: The error usually arises due to one of the following reasons: Invalid Group Name: The group name specified for parallel processing does not exist or is incorrectly defined.
Configuration Issues: There may be issues in the configuration settings related to the parallel processing setup. Authorization Issues: The user may not have the necessary authorizations to access or initialize the specified group. Technical Issues: There could be underlying technical issues in the system that prevent the proper initialization of the group.
Solution: To resolve the CNV_CDMC_CA055 error, you can take the following steps: Check Group Name: Verify that the group name you are using is correct and exists in the system. You can check this in the
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
CNV_CDMC_CA054 Unable to perform mass comparison
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_CDMC_CA053 Communication failure has occurred while performing mass comparison
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_CDMC_CA056 Internal error while initializing the parallel processing
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_CDMC_CA057 Work processes already initialized
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.