How To Fix WS633 - Selection option not allowed if selection of messages = "1"

SAP Error Message - Details

• Message type: E = Error

• Message class: WS - Supplier Billing Document

• Message number: 633

• Message text: Selection option not allowed if selection of messages = "1"

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• What is the cause and solution for SAP error message WS633 - Selection option not allowed if selection of messages = "1" ?

  SAP Error Message:
  
  WS633 - Selection option not allowed if selection of messages = "1"
  
  Cause:
  This error occurs when you try to use a selection option (range or multiple values) in a selection screen field that is configured to accept only a single value (i.e., the selection of messages is set to "1" which means single selection). The system does not allow selection options (which imply multiple values or ranges) when the parameter or selection field is restricted to a single value.
  In other words, the selection parameter or field is defined with the attribute SELMSG = '1' (single selection), but the user or program tries to input a selection option (e.g., a range or multiple values), which is not permitted.
  
  Explanation:
  
  SELMSG = '1' means the selection field accepts only one single value.
  Selection option means the user can enter multiple values or ranges (e.g., 1000 to 2000 or 1000, 1500, 2000).
  If the field is defined for single value input, the system throws WS633 when a selection option is entered.
  
  
  Solution:
  
  
  Adjust the selection parameter definition:
  
  If multiple values or ranges are required, change the parameter or select-option definition to allow multiple selections.
  For example, use a SELECT-OPTION instead of a PARAMETER, or set the parameter attribute to allow multiple values.
  
  
  
  Modify the selection screen:
  
  If the business logic requires only a single value, ensure the user inputs only one value (no ranges or multiple entries).
  Validate the input to prevent selection options.
  
  
  
  Check the ABAP code:
  
  Review the selection screen code where the parameter or select-option is defined.
  For example:
  PARAMETERS p_matnr TYPE matnr SELMSG '1'. " Single value only
  If multiple values are needed, change to:
  SELECT-OPTIONS s_matnr FOR matnr.
  
  Or if you want to keep PARAMETERS but allow multiple values, you need to redesign the selection screen.
  
  
  
  User training:
  
  Inform users that only single values are allowed for this field.
  Prevent entering ranges or multiple values.
  
  
  
  
  Related Information:
  
  SELMSG parameter: Controls whether a parameter allows single or multiple values.
  PARAMETERS vs SELECT-OPTIONS:
  
  PARAMETERS: Usually single value input.
  SELECT-OPTIONS: Allows ranges and multiple values.
  
  
  SAP Note / Documentation: Check SAP standard documentation on selection screens and SELMSG attribute.
  Common scenario: This error often appears in report selection screens or transaction variants where the selection screen field is restricted to single value but user tries to input multiple values or ranges.
  
  
  Summary:
  
  
  
  Aspect
  Description
  
  
  
  
  Cause
  Selection option (range/multiple values) used on a field defined for single value only (SELMSG = '1').
  
  
  Solution
  Change field to allow multiple values (use SELECT-OPTIONS) or restrict user input to single value only.
  
  
  Related Info
  SELMSG attribute, PARAMETERS vs SELECT-OPTIONS, selection screen design.
  
  
  
  
  If you provide the relevant code snippet or transaction context, I can help you with a more specific fix.