Message type: E = Error
Message class:  CNV - Conversion: Messages for Conversion Services (CNCC) 
Message number: 131
Message text: No records that should be deleted found in table CNVTABLESCU
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 CNV131 ("No records that should be deleted found in table CNVTABLESCU") typically occurs during data migration or conversion processes, particularly when using the SAP Landscape Transformation (SLT) or SAP Data Services tools. This error indicates that the system did not find any records in the specified table (CNVTABLESCU) that meet the criteria for deletion.
Cause:
No Matching Records: The most common cause is that there are no records in the CNVTABLESCU table that match the criteria for deletion. This could be due to:
The records have already been deleted.
The records were never created or populated in the first place.
The selection criteria used for deletion do not match any existing records.
Incorrect Configuration: There may be an issue with the configuration of the data migration process, leading to incorrect assumptions about the data present in the system.
Data Integrity Issues: There could be underlying data integrity issues that prevent the expected records Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
CNV130 **  CNV_00001_PAKET_LADEN continued
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV128 Failed to initialize state management.
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV132 No records that should be deleted found in table CNVFIELDSCU
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV133 No records that should be deleted found in table CNVFIPARSCU
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.