Message type: E = Error
Message class:  /STMC/CR_MSG -  
Message number: 793
Message text: Changes in layer &1 are not allowed
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 /STMC/CR_MSG793 Changes in layer &1 are not allowed typically occurs in the context of SAP's Change Request Management (ChaRM) or when working with transport layers in the SAP system. This error indicates that you are trying to make changes in a transport layer that is not permitted due to certain restrictions or configurations.
Cause: Layer Restrictions: The transport layer you are trying to modify may be set to a status that does not allow changes. For example, it could be a production layer or a layer that is locked for changes. Authorization Issues: The user may not have the necessary authorizations to make changes in the specified layer. Configuration Settings: The system may be configured to prevent changes in certain layers to maintain integrity and stability, especially in production environments. Transport Route Issues: There may be issues with the transport route configuration that prevent changes from being made.
Solution: Check Layer Status: Verify
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
/STMC/CR_MSG792 Wrong request sequence; missing &1 request for provider &2
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
/STMC/CR_MSG791 Invalid &1 in condition of sequence no. &2
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
/STMC/CR_MSG794 Multiple data not allowed
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
/STMC/CR_MSG795 The definition of an active rule must not span several layers: &1 - &2
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.