How To Fix 5P037 - Only the characters X ' ' are allowed (' ' not possible in variable key)

SAP Error Message - Details

• Message type: E = Error

• Message class: 5P - Error Messages for Schema, Pers.Calc.Rule and Feature Checks

• Message number: 037

• Message text: Only the characters X ' ' are allowed (' ' not possible in variable key)

What causes this issue?

This error can occur during an operation or in the variable key.
In both cases, it means that you have used incorrect characters.

How to fix this error?

Read the related documentation and correct the entry.
You cannot use " " for the query in the variable key. The following
two entries are required:
one entry with "X" as the value,
one entry with "*" as the value which represents the "OTHERS".
The "*" entry then implicitly represents a query using " ".

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message 5P037 - Only the characters X ' ' are allowed (' ' not possible in variable key) ?

  The SAP error message 5P037 indicates that there is an issue with the input of a variable key in a certain context, typically related to the use of characters in a selection screen or a data entry field. The message states that only the characters 'X' (for true) and ' ' (space for false) are allowed, and that a space (' ') is not possible in the variable key.
  Cause:
  
  Invalid Input: The variable key is expected to be either 'X' or a blank space. If any other character is entered, this error will occur.
  Configuration Issue: There may be a configuration issue in the way the variable key is defined or used in the program or report.
  Data Entry Error: Users may inadvertently enter invalid characters or spaces that are not allowed.
  
  Solution:
  
  Check Input: Ensure that the input for the variable key is strictly 'X' or a blank space. Remove any other characters that may have been entered.
  Review Program Logic: If you are a developer or have access to the program, review the logic where the variable key is being set or processed. Ensure that it is correctly handling the expected values.
  Configuration Review: If the error persists, check the configuration settings related to the variable key in the relevant transaction or report. Ensure that it is set up to accept only the allowed characters.
  User Training: If this error is common among users, consider providing training or documentation to clarify the expected input for the variable key.
  
  Related Information:
  
  Transaction Codes: This error may occur in various transaction codes where variable keys are used, such as in reports or data entry screens.
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message. Sometimes, SAP releases updates that address specific error messages.
  Debugging: If you have access to debugging tools, you can trace the program execution to see where the invalid input is being generated or processed.
  
  If the issue continues after following these steps, it may be beneficial to consult with your SAP support team or refer to SAP documentation for further assistance.