Message type: E = Error
Message class:  CNV_PE_CHECK - Check Framework messages for posting engine 
Message number: 104
Message text: Transformation rule (ID: &1) in SMAP item of SMAP &2 does not exist
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_PE_CHECK104 indicates that there is a problem with a transformation rule in the context of a data migration or conversion process, specifically within the SMAP (Source Mapping) item. The error message states that the transformation rule with the specified ID does not exist in the specified SMAP item.
Cause: Missing Transformation Rule: The transformation rule (ID: &1) that is referenced in the SMAP item (SMAP &2) is not defined or has been deleted. Incorrect Configuration: There may be a misconfiguration in the mapping settings, leading to the system looking for a rule that is not available. Data Migration Project Issues: If this error occurs during a data migration project, it could be due to incomplete setup or missing components in the migration project.
Solution: Check Transformation Rules: Go to the relevant transaction or tool where transformation rules are defined (e.g., transaction code LTMC for migration). Verify if the transformation rule with the specified ID
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
CNV_PE_CHECK103 Transformation rule not present in structure mapping item of SMAP &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_PE_CHECK102 Interface mapping ID not present in structure mapping item of SMAP &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_PE_CHECK105 SMAP &2 (within the PMAP &1) is not contained in the IF_MAP at all
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_PE_CHECK106 Transformation rule does not exist in parameter mapping &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.