Message type: E = Error
Message class:  CNV_NCE_BAS - Number conversion engine: messages 
Message number: 019
Message text: Object does not exist in the knowledge base (excluded or not relevant)
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_NCE_BAS019 typically indicates that a specific object does not exist in the knowledge base, which may be due to it being excluded or deemed not relevant for the current context. This error is often encountered during data migration or conversion processes, particularly when using SAP's Conversion Tools or during the execution of a project that involves data transformation. Causes: Object Exclusion: The object you are trying to access may have been explicitly excluded from the knowledge base. This could be due to project-specific configurations or settings. Relevance Criteria: The object may not meet the criteria for relevance in the context of the current migration or conversion process.
Configuration Issues: There may be issues with the configuration of the migration tools or the knowledge base itself. Version Mismatch: The object may not exist in the version of the knowledge base you are using, especially if there have been updates or changes in
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
CNV_NCE_BAS018 Number interval &1 (subobject &2) does not exist in NRIV
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_NCE_BAS017 Mapping tables are inconsistent
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_NCE_BAS020 &1 Range &2 &3: target level is bigger than upper limit
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_NCE_BAS021 &1 Range &2 &3: warning limit is reached
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.