Message type: E = Error
Message class:  /IWXBE/CM_CORE_DT -  
Message number: 012
Message text: Topic '&1' exceeds maximum length
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 /IWXBE/CM_CORE_DT012 indicates that a specific topic (in this case, represented by &1) exceeds the maximum length allowed in the system. This error typically occurs in the context of SAP's Business Technology Platform (BTP) or when dealing with SAP's integration and communication services.
Cause: The error is caused by the fact that the topic name you are trying to use exceeds the predefined character limit set by SAP. Each topic in SAP has a maximum length, and if the name of the topic exceeds this limit, the system will throw this error.
Solution: To resolve this error, you can take the following steps: Check the Topic Name: Review the topic name you are trying to use. Ensure that it does not exceed the maximum length allowed by SAP. The maximum length for topic names is typically 128 characters, but you should verify this in the specific documentation for your SAP version or
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
/IWXBE/CM_CORE_DT011 Topic '&1' is not changeable
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
/IWXBE/CM_CORE_DT010 Type name '&1' uses reservered SAP internal prefix
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
/IWXBE/CM_CORE_DT013 Topic must not be initial
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
/IWXBE/CM_CORE_DT014 Payload type '&1' not yet bound to structure
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.