Message type: E = Error
Message class:  CNV_10996 - Messages for archive conversion 
Message number: 030
Message text: Derivation in CNVFIELDREF for &1-&2 contains errors.
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_10996030 typically occurs during data migration or conversion processes, particularly when using the SAP S/4HANA Migration Cockpit or other data migration tools. This error indicates that there is an issue with the derivation logic in the field reference mapping, specifically in the context of the conversion of data from one format or structure to another.
Cause: The error message CNV_10996030 suggests that there are errors in the derivation rules defined for the fields involved in the conversion process. This could be due to several reasons, including: Incorrect Mapping: The source and target fields may not be correctly mapped, leading to inconsistencies. Data Type Mismatch: The data types of the source and target fields may not be compatible. Missing Values: Required fields may be missing values, which are necessary for the derivation logic to work. Invalid Logic: The derivation logic itself may contain errors, such as syntax errors or logical inconsistencies.
Configuration Issues: There
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
CNV_10996029 Package &1 was activated!
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_10996028 Error during update/modify to table &1.
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_10996031 No conversion routine found for table &1, field &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_10996032 No generated program found for table &1.
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.