Message type: E = Error
Message class:  MSI_CUST_PRODCAT - Message Class for Loading to Category Hierarchies 
Message number: 012
Message text: No object type for schema ID &2 found in key mapping context &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.
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 MSI_CUST_PRODCAT012 indicates that there is an issue with the key mapping context in the Master Data Management (MDM) or Product Catalog area. Specifically, it suggests that the system cannot find an object type for the specified schema ID in the given key mapping context.
Cause: Missing Object Type: The schema ID referenced in the error does not have a corresponding object type defined in the system. Incorrect Configuration: There may be a misconfiguration in the key mapping context or the schema itself. Data Inconsistency: The data being processed may not align with the expected structure or definitions in the system. Transport Issues: If the schema or object types were recently transported from another system, there may have been issues during the transport process.
Solution: Check Schema Configuration: Go to the relevant configuration area in SAP and verify that the schema ID exists and is correctly defined. Ensure that the object types associated with the schema
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
MSI_CUST_PRODCAT011 No schema ID for object type &2 found in key mapping context &1
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
MSI_CUST_PRODCAT010 No key mapping context found for object type &1
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
MSI_CUST_PRODCAT050 Object type &1 is not intended for this functional flow
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
MSI_CUST_PRODCAT051 Strategy implementation supports transaction context BAPI only
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.