How To Fix WS020 - Select a line

SAP Error Message - Details

• Message type: E = Error

• Message class: WS - Supplier Billing Document

• Message number: 020

• Message text: Select a line

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message WS020 - Select a line ?

  SAP Error Message:
  
  WS020 - Select a line
  
  Cause:
  The error message WS020 - Select a line typically occurs when a user tries to perform an action (such as editing, deleting, or processing) on a list or table without first selecting a specific line or entry. The system expects the user to highlight or mark a particular row before proceeding, but no line has been selected.
  
  When does it occur?
  
  In transaction screens or reports where multiple entries are displayed in a list or table format.
  When the user clicks a button or tries to execute a function that requires a line selection.
  Common in workflow tasks, list processing, or mass processing screens.
  
  
  Solution:
  
  
  Select a line:
  
  Before performing the action, click on the desired line in the list or table to highlight it. This tells the system which record you want to work with.
  
  
  Check UI controls:
  
  Ensure that the selection mechanism (checkbox, radio button, or row highlight) is properly used as per the screen design.
  
  
  If using keyboard:
  
  Use arrow keys or other navigation keys to move the cursor to the desired line.
  
  
  If the problem persists:  
  
  Verify if the list is correctly populated.
  Check for any screen or authorization issues that might prevent selection.
  Sometimes, a screen refresh or re-execution of the report helps.
  
  
  
  
  Related Information:
  
  This message is a standard prompt to ensure user clarity and prevent unintended operations on multiple or no records.
  It is often seen in workflow inboxes, mass change transactions, or any SAP GUI screen with line item processing.
  The message class is usually WS (Workflow or List Processing related).
  If you are developing or customizing screens, ensure that the selection logic is properly implemented and that the system checks for line selection before processing.
  
  
  Summary:
  
  
  
  Aspect
  Details
  
  
  
  
  Message
  WS020 - Select a line
  
  
  Cause
  No line selected in a list/table
  
  
  Solution
  Select the desired line before proceeding
  
  
  Context
  Workflow tasks, list processing, mass changes
  
  
  
  
  If you provide the exact transaction or scenario where this occurs, I can give more tailored advice.