Message type: E = Error
Message class:  CNV_20100 - Messageclass for chart of account conversion 
Message number: 342
Message text: Routine &1 is not specified in CNV_00001_FORMS. Contact SAP for support
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_20100342 indicates that a specific routine (denoted as &1) is not defined in the table CNV_00001_FORMS. This error typically arises during data migration or conversion processes, particularly when using SAP's Conversion Tools or Data Migration tools.
Cause: Missing Routine Definition: The routine that is being called during the conversion process is not defined in the CNV_00001_FORMS table. This could happen if the routine was not created, was deleted, or if there is a mismatch in the naming conventions.
Configuration Issues: There may be issues with the configuration of the migration project or the specific settings that are supposed to link to the routine. Version Compatibility: The error might also occur if there are compatibility issues between the version of the migration tool being used and the SAP system.
Solution: Check Routine Definition: Verify if the routine specified in the error message exists in the CNV_00001_FORMS table. You can do this by accessing
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
CNV_20100341 Jobs were scheduled and released
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_20100340 SUBMIT job: & SUBMIT not possible
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_20100343 Error while generating dynamic coding; error code &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_20100344 There is no old set data
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.