Message type: E = Error
Message class:  AQV - Message texts for SAP Query 
Message number: 320
Message text: Place the cursor on an input line
The page header and page footer have input areas in which you can enter
text.
You want to enter a new line in one of these areas with the function
'Insert line' or delete a line with the function 'Delete line'. The
cursor must be in an input area.
The system issues an error message and will not allow you to continue with this transaction until the error is resolved.
Place the cursor on a line in one of the input areas. The new line is
inserted after this line (function 'Insert line') or this line is
deleted (function 'Delete line').
Error message extract from SAP system. Copyright SAP SE.
The SAP error message AQV320, which states "Place the cursor on an input line," typically occurs in the context of data entry or processing within an SAP application. This message indicates that the system expects the user to select or highlight a specific line or entry in a table or list before proceeding with an action.
Cause: User Action Required: The error usually arises when the user attempts to perform an action (like editing, deleting, or processing) without first selecting a specific line or entry in a list or table. Incorrect Focus: The cursor may not be positioned correctly on an input line, leading to the system not recognizing the intended target for the action. User Interface Design: Some SAP screens require explicit selection of a line to ensure that the user is aware of which entry they are working with.
Solution: Select the Input Line: Move the cursor to the desired line in the table
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