How To Fix FKKINV396 - Billing item type &1 is either unknown or not allowed

FKKINV396 - Overview

• Message type: E = Error

• Message class: FKKINV - Invoicing in Contract Accounts Receivable and Payable

• Message number: 396

• Message text: Billing item type &1 is either unknown or not allowed

Self-Explanatory Message

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FKKINV396 - Details

• The SAP error message FKKINV396 indicates that the billing item type specified in the transaction is either unknown or not allowed in the context of the operation being performed. This error typically occurs in the context of contract accounts receivable and payable (FI-CA) when processing billing documents.
  Causes:
  
  Incorrect Billing Item Type: The billing item type specified may not exist in the system or may not be configured correctly.
  
  Configuration Issues: The billing item type may not be allowed for the specific transaction or process you are trying to execute.
  Missing Customization: The billing item type may not have been properly set up in the system, or it may not be assigned to the relevant billing process.
  Authorization Issues: The user may not have the necessary authorizations to use the specified billing item type.
  
  Solutions:
  
  Check Billing Item Type: Verify that the billing item type specified in the transaction is correct and exists in the system. You