How To Fix WXP156 - Select one line only in the list

SAP Error Message - Details

• Message type: E = Error

• Message class: WXP - Retail Planning

• Message number: 156

• Message text: Select one line only in the list

What causes this issue?

You have chosen a function that only requires one argument. You can
specify this by selecting one line in the relevant list.
When the function was called, either no lines or multiple lines were
selected and thus the function was not specified clearly enough.
If the list contains one line only, it is used to specify the argument
for your function.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Select one line only in the relevant list and call the function once
again.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message WXP156 - Select one line only in the list ?

  Certainly! Here's detailed information about the SAP error message WXP156 - "Select one line only in the list":
  
  Error Message:
  WXP156 - Select one line only in the list
  
  Cause:
  This error occurs when a user is expected to select exactly one line (one entry) from a list or table in an SAP transaction or report, but:
  
  No line is selected, or
  More than one line is selected.
  
  The program or function module requires a single, unambiguous selection to proceed, and multiple or zero selections violate this requirement.
  
  When does it typically occur?
  
  When processing lists in SAP Web Dynpro applications.
  When using selection screens or ALV (ABAP List Viewer) grids where single selection mode is enforced.
  In transactions or custom programs where the logic expects exactly one item to be chosen for further processing.
  
  
  Solution:
  
  
  Select exactly one line:
  
  Review the list or table displayed.
  Make sure to select only one entry (row).
  If multiple lines are selected, deselect all but one.
  If no line is selected, select one.
  
  
  
  Check selection mode:
  
  If you are a developer or customizing the program, ensure that the selection mode of the list or ALV grid is set to single selection.
  For ALV grids, use the method set_selection_mode with parameter single to restrict selection to one line.
  
  
  
  User training:
  
  Inform users about the requirement to select only one line before proceeding.
  Provide clear instructions or UI hints if possible.
  
  
  
  Debugging (for developers):
  
  Check the code where the selection is read.
  Verify that the program checks the number of selected lines and throws this error if the count is not exactly one.
  Adjust the logic if multiple selections are valid or handle the case accordingly.
  
  
  
  
  Related Information:
  
  Message Class: WXP (Web Dynpro messages)
  Message Number: 156
  Transaction: Can appear in various transactions or custom Web Dynpro applications.
  SAP Notes: No specific SAP Note universally applies, but searching for WXP156 in SAP Support Portal may provide notes related to specific scenarios.
  ALV Selection Modes:  
  
  cl_gui_alv_grid=>set_selection_mode( 'SINGLE' ) for single selection.  
  cl_gui_alv_grid=>set_selection_mode( 'MULTI' ) for multiple selections.
  
  
  
  
  Summary:
  
  
  
  Aspect
  Description
  
  
  
  
  Cause
  User selected zero or multiple lines instead of exactly one.
  
  
  Effect
  Program cannot proceed due to ambiguous selection.
  
  
  Solution
  Select exactly one line before continuing.
  
  
  Developer Tip
  Enforce single selection mode in UI controls.
  
  
  
  
  If you provide the context or transaction where this error occurs, I can help with more specific guidance!