Message type: E = Error
Message class: WTADDI - Additionals: Messages
Message number: 421
Message text: Select a valid line
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SAP Error Message: WTADDI421 - Select a valid line
Cause: The error message WTADDI421 - Select a valid line typically occurs in SAP when you are working with warehouse tasks or warehouse management transactions, and the system expects you to select a valid line item (e.g., a line in a list of warehouse tasks, transfer orders, or delivery items) but none or an invalid line is selected. Common scenarios include: Trying to perform an action (e.g., confirm, delete, or change) on a warehouse task or transfer order without selecting any line. Selecting a line that is not valid for the intended operation (e.g., a line that is already processed or locked). The screen or list is empty or the selection cursor is not on a valid line.
Solution: Select a valid line: Make sure you select a line item in the list before performing the action. Click on the line or use the selection checkbox if available. Check the status of
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