How To Fix W3_API201 - Theme names must contain numerals only

SAP Error Message - Details

• Message type: E = Error

• Message class: W3_API - WAB: API Messages

• Message number: 201

• Message text: Theme names must contain numerals only

Self-Explanatory Message

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• What is the cause and solution for SAP error message W3_API201 - Theme names must contain numerals only ?

  SAP Error Message:
  W3_API201 Theme names must contain numerals only
  
  
  Cause:
  This error occurs when you try to create or use a theme name in SAP Fiori or SAP UI5 that contains characters other than numerals. The system expects the theme name to be strictly numeric (digits 0-9) without any alphabetic or special characters.
  This restriction is typically related to the naming conventions enforced by the SAP Fiori launchpad or UI5 theming engine, where theme identifiers must be numeric strings to ensure consistency and avoid conflicts.
  
  Explanation:
  
  Theme names are identifiers used in SAP UI5/Fiori to apply custom styles.
  Some SAP systems or tools (like the Theme Designer or the Fiori launchpad configuration) require theme names to be numeric only.
  If you enter a theme name with letters, spaces, or special characters, the system throws this error.
  
  
  
  Solution:
  
  
  Use only numerals in the theme name.
  For example, instead of Theme01 or MyTheme123, use 01, 123, or any numeric string like 1001.
  
  
  Rename