Message type: E = Error
Message class:  CNV_IUUC_REPL_ADV_SE - MEssage class for package CNV_IUUC_REPL_ADV_SETTINGS 
Message number: 037
Message text: Position & occurs more than once in modification overview
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_IUUC_REPL_ADV_SE037 typically occurs during the data migration process, particularly when using the SAP Landscape Transformation (SLT) replication or during the conversion of data in the context of SAP S/4HANA migrations. This error indicates that a specific position (or entry) appears more than once in the modification overview, which can lead to conflicts or inconsistencies in the data being processed.
Cause: The error is generally caused by: Duplicate Entries: The same record or position is being modified multiple times in the modification overview, which can happen due to incorrect data preparation or configuration. Data Consistency Issues: There may be inconsistencies in the source data that lead to multiple modifications being attempted on the same record. Configuration Errors: Incorrect settings in the SLT configuration or in the data migration process can lead to this issue.
Solution: To resolve the CNV_IUUC_REPL_ADV_SE037 error, you can follow these steps: Check Modification Overview: Review the modification overview to identify the
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
CNV_IUUC_REPL_ADV_SE036 Fieldname & occurs more than once in modification overview
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_IUUC_REPL_ADV_SE035 Table field & is already available in modification overview
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_IUUC_REPL_ADV_SE038 Fill all the position values
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_IUUC_REPL_ADV_SE039 Fill all the length values
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.