Message type: E = Error
Message class:  BG - Warranty processing 
Message number: 091
Message text: Warranty check: Void muster warranty
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.
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The SAP error message BG091, which states "Warranty check: Void muster warranty," typically occurs during the warranty check process in SAP when the system identifies an issue with the warranty data associated with a particular transaction or material. Here’s a breakdown of the potential causes, solutions, and related information for this error: Causes: Invalid Warranty Data: The warranty data for the material or product may be incomplete or incorrectly configured in the system. Expired Warranty: The warranty period for the item may have expired, leading to the system flagging it as void. Incorrect Configuration: The warranty configuration in the system may not align with the business rules or requirements. Missing Master Data: Essential master data related to the warranty (like warranty types or conditions) may be missing or incorrectly set up. Transaction Context: The error may arise in specific transaction contexts, such as during sales order processing, delivery, or service order processing. Solutions: Check Warranty Data: Review the
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