Message type: E = Error
Message class:  CNV20551 - message for package 20551 (company code delete) 
Message number: 803
Message text: Security check failed for program &1.
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.
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The SAP error message CNV20551803, which states "Security check failed for program &1," typically indicates that there is a security authorization issue related to the execution of a specific program or transaction in the SAP system. This error is often encountered during data migration or conversion processes, particularly when using SAP's tools for data migration.
Cause: Authorization Issues: The user executing the program does not have the necessary authorizations to run the specified program. This could be due to missing roles or authorizations in the user's profile. Program Restrictions: The program may have specific security checks implemented that restrict access based on user roles or profiles. Transport Issues: If the program was recently transported from another system, it may not have the correct authorizations set up in the target system.
Solution: Check User Authorizations: Verify that the user has the necessary authorizations to execute the program. This can be done by checking the user's roles and authorizations
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