Message type: E = Error
Message class:  MPE_AHF_MSG - Message Class - Action Hook Framework 
Message number: 045
Message text: ObjType &1 is missing in MPE_AHF_C_OBTYPE
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.
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The SAP error message MPE_AHF_MSG045 indicates that there is a missing object type in the configuration table MPE_AHF_C_OBTYPE. This error typically arises in the context of the SAP Advanced Business Application Programming (ABAP) or when working with specific modules that require certain object types to be defined in the system.
Cause: The error occurs when the system attempts to access or process an object type that is not defined in the MPE_AHF_C_OBTYPE table. This can happen due to several reasons:
Configuration Issues: The object type may not have been configured correctly in the system. Data Migration: If data was migrated from another system, the object type may not have been included in the migration process. Custom Development: If there are custom developments or enhancements, they may reference an object type that has not been defined.
Solution: To resolve this error, you can follow these steps: Check the Object Type: Identify the object type that is causing the error
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