Message type: E = Error
Message class:  CNV_DMC_SIN - Messages for s-innovations migration 
Message number: 129
Message text: Unexpected Cost Center &1 in the translation rule &2
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_DMC_SIN129 indicates that there is an unexpected cost center in the translation rule during a data migration or conversion process. This error typically arises in the context of using the SAP Data Migration Cockpit (DMC) or during the execution of a migration project where cost centers are being mapped or translated.
Cause: Invalid Cost Center: The cost center specified in the translation rule does not exist in the target system or is not valid for the current context. Incorrect Mapping: There may be an issue with how the cost centers are mapped in the translation rules, leading to discrepancies.
Configuration Issues: The configuration settings for cost centers in the source or target system may not align, causing the system to not recognize the cost center. Data Integrity Issues: There may be issues with the data being migrated, such as missing or incorrect entries in the source data.
Solution: Verify Cost Center: Check the
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
CNV_DMC_SIN128 Texts: app object can not be initial in &1, classification material is &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_DMC_SIN127 Tax category cannot be initial in &1, classification for customer is &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_DMC_SIN130 Unexpected Customer Number &1 in the translation rule &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_DMC_SIN131 Unexpected Vendor Number &1 in the translation rule &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.