How To Fix WP427 - Tax classifier & cannot be converted

SAP Error Message - Details

• Message type: E = Error

• Message class: WP - Messages from POS interface

• Message number: 427

• Message text: Tax classifier & cannot be converted

What causes this issue?

The conversion rule for tax classifier &V1& is not known.

System Response

The record cannot be prepared in POS - interface outbound processing.
The document cannot be booked in the SAP system in POS - interface
inbound processing.

How to fix this error?

Define the conversion rule for the tax classifier.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message WP427 - Tax classifier & cannot be converted ?

  The SAP error message WP427: Tax classifier & cannot be converted typically occurs during tax determination or tax calculation processes, especially in the context of sales and distribution (SD) or financial accounting (FI) modules.
  
  Cause
  
  The error indicates that the system is unable to convert or interpret the tax classifier value during tax determination.
  This usually happens when the tax classifier (a key or code used to classify tax conditions) is missing, incorrect, or not maintained properly in the tax condition records or tax procedure.
  It can also occur if there is a mismatch between the tax classification in the master data (e.g., customer or material tax classification) and the tax condition records.
  Another cause might be an inconsistency or missing configuration in the tax procedure or tax condition tables.
  
  
  Solution
  
  
  Check Tax Classifier Configuration:
  
  Verify the tax classifier values in the tax condition records (transaction codes like VK11, VK12).
  Ensure that the tax classifier used in the condition records matches the expected values in the tax procedure.
  
  
  
  Verify Master Data:
  
  Check the tax classification in the customer master (transaction XD03 or VD03) and material master (transaction MM03).
  Ensure that the tax classification fields are correctly maintained and consistent with the tax condition records.
  
  
  
  Review Tax Procedure:
  
  Use transaction OBYZ or FTXP to review the tax procedure and ensure that the tax classifier fields are correctly defined and mapped.
  Check if any custom tax procedures or condition types are involved and verify their configuration.
  
  
  
  Debugging / Trace:
  
  If the above steps do not resolve the issue, enable tax trace (using transaction FTXP or debugging tools) to identify where the conversion fails.
  Analyze the program logic or user exits/enhancements if custom code is involved in tax determination.
  
  
  
  SAP Notes and Support:
  
  Search for relevant SAP Notes on the SAP Support Portal using the error message code WP427.
  Apply any recommended patches or corrections if available.
  
  
  
  
  Related Information
  
  
  Transaction Codes:
  
  VK11 / VK12 / VK13 – Maintain tax condition records
  OBYZ – Define tax procedure
  FTXP – Tax code configuration
  XD03 / VD03 – Display customer master
  MM03 – Display material master
  
  
  
  Modules Involved:
  
  Sales and Distribution (SD)
  Financial Accounting (FI)
  Tax Configuration
  
  
  
  Common Scenarios:
  
  Tax determination during billing or invoice creation.
  Tax calculation in sales orders or deliveries.
  Integration between SD and FI tax processes.
  
  
  
  
  If you provide more context (e.g., transaction where the error occurs, customizations, or screenshots), I can help with a more specific solution.