Message type: E = Error
Message class:  VN2 - Output Class for RSNASTCK 
Message number: 054
Message text: Medium task: Task not compatible with application
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.
SAP Error Message: VN2054 - Medium task: Task not compatible with application
Cause: The error message VN2054 occurs when you try to assign or process a medium task that is not compatible with the selected application in the Vendor Master or related procurement process. In SAP, medium tasks are often related to workflow or specific processing steps, and each task is designed to work with certain applications or modules. This incompatibility typically arises because: The medium task you are trying to assign or execute is designed for a different application area than the one currently in use. There is a mismatch between the task definition and the application context. Customizing or configuration settings for medium tasks and their assignment to applications are incorrect or incomplete.
Solution: To resolve the VN2054 error, follow these steps: Check Task and Application Assignment: Verify the medium task you are trying to use is assigned to the correct application. Use transaction SPRO to navigate to the customizing
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
VN2053 Medium task: Task not specified
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
VN2052 Medium event: Event & does not exist
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
VN2055 No condition records found for application & output type &
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
VN2056 Condition table: & test of all accesses
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.