How To Fix WS671 - Tax flags are missing on item level (document &1 cannot save)

SAP Error Message - Details

• Message type: E = Error

• Message class: WS - Supplier Billing Document

• Message number: 671

• Message text: Tax flags are missing on item level (document &1 cannot save)

Self-Explanatory Message

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• What is the cause and solution for SAP error message WS671 - Tax flags are missing on item level (document &1 cannot save) ?

  SAP Error Message:
  WS671 - Tax flags are missing on item level (document &1 cannot save)
  
  
  Cause:
  This error occurs when the system tries to save a document (such as a sales order, billing document, or purchase order), but the tax-related flags or tax classification data at the item level are missing or incomplete. The tax determination process requires certain tax flags or tax codes to be present on each item to correctly calculate taxes. If these are not maintained or are missing, the system cannot proceed with saving the document.
  Common scenarios causing this error include:
  
  Missing or incomplete tax classification on the material master or customer/vendor master.
  Incorrect or missing tax codes in the pricing or condition records.
  Customizing issues in tax determination procedure.
  Incomplete or missing tax-related data in the item details during document creation.
  
  
  
  Solution:
  
  
  Check Tax Classification:
  
  Verify that the material master has the correct tax classification maintained (e.g., in MM02 under Sales: Sales Org. 2