Message type: E = Error
Message class:  WV - Messages about Sales Price Calculation 
Message number: 456
Message text: Sales currency &1 is not allowed
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The SAP error message WV456, which states "Sales currency &1 is not allowed," typically occurs in the context of sales order processing, billing, or other financial transactions where a specific currency is not permitted for the operation being performed. Here’s a breakdown of the potential causes, solutions, and related information for this error: Causes: Currency Configuration: The sales currency specified in the transaction is not configured in the system. This could be due to missing settings in the company code or sales area configuration. Master Data Issues: The customer master data or material master data may not have the required currency set up. Transaction Type Restrictions: Certain transaction types may have restrictions on the currencies that can be used. Cross-Company Code Transactions: If the transaction involves multiple company codes, the currencies may not align or be allowed across those codes. Currency Type Settings: The currency type (e.g., transaction currency, document currency) may not be set up
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