How To Fix WF501 - Fill only one field for selection

SAP Error Message - Details

• Message type: E = Error

• Message class: WF - Workflow: messages

• Message number: 501

• Message text: Fill only one field for selection

Self-Explanatory Message

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• What is the cause and solution for SAP error message WF501 - Fill only one field for selection ?

  SAP Error Message:
  
  WF501 - Fill only one field for selection
  
  Cause:
  This error occurs in SAP Workflow when a selection screen or a selection step requires the user to fill in exactly one field, but the user has either:
  
  Filled in more than one field simultaneously, or  
  Left all fields empty when at least one is required.
  
  In other words, the selection criteria are designed to accept only one input field to identify the object or data uniquely, but multiple fields have been filled, causing ambiguity.
  
  When does it occur?
  
  During workflow task selection screens or workflow container element selection steps.
  When a step or condition expects a single input field to determine the workflow path or object.
  In custom or standard workflows where selection screens are used to filter or identify objects.
  
  
  Solution:
  
  Fill only one field: Ensure that only one of the available selection fields is filled. Leave the others blank.
  Check the selection screen: Review the selection screen or input form and enter data in only one field.
  Adjust workflow logic (if applicable): If the workflow design requires multiple fields to be filled, the logic or selection screen needs to be adjusted to allow multiple entries or to handle multiple inputs properly.
  User training: Inform users about the requirement to fill only one field in the selection screen.
  
  
  Additional Information:
  
  This message is a standard SAP workflow message to prevent ambiguous or conflicting input.
  The message text is:
  
  "Fill only one field for selection"
  The message class is usually WF (Workflow).
  If you are developing or customizing workflows, ensure that selection screens or container elements are designed to accept only one input field or handle multiple inputs correctly.
  Check the workflow step or container element where the selection is made to verify the input parameters.
  
  
  Example:
  Suppose a workflow step requires the user to enter either a Purchase Order Number or a Material Number to proceed. If the user enters both, the system throws WF501 to indicate that only one should be entered to avoid confusion.
  
  If you need to debug or analyze further:
  
  Use transaction SWI1 to check workflow logs.
  Use transaction SWDD to check workflow definitions.
  Check the selection screen or input screen associated with the workflow step.
  Review the code or method that processes the selection input.
  
  
  Summary:
  
  WF501 is triggered when more than one selection field is filled in a context where only one is allowed. The fix is to enter data in only one field or adjust the workflow logic accordingly.