How To Fix AH663 - Key date is missing for month-based billing

SAP Error Message - Details

• Message type: E = Error

• Message class: AH - IS-U billing (master data)

• Message number: 663

• Message text: Key date is missing for month-based billing

What causes this issue?

Installation &V1& contains <DS:DE.TARIFTYP>rate category</> &V2& until
the end of the billing period. The indicator <DS:DE.MWSTMBEZ>interpret
tax changes on a monthly basis</> is set for this rate category.
Therefore, a <DS:DE.E_STICHTAG>key date</> for billing on a monthly
basis must be specified in the meter reading unit of the installation.
This is not the case.

System Response

The installation cannot be billed.

How to fix this error?

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message AH663 - Key date is missing for month-based billing ?

  The SAP error message AH663, which states "Key date is missing for month-based billing," typically occurs in the context of billing processes, particularly when dealing with month-based billing cycles in SAP. This error indicates that the system is unable to find a key date that is necessary for processing the billing document.
  Cause:
  The error can be caused by several factors, including:
  
  Missing Key Date: The key date for the billing period is not defined in the billing document or the related master data.
  Incorrect Configuration: The billing type or the billing plan may not be configured correctly, leading to the absence of a key date.
  Incomplete Master Data: The customer or contract master data may be incomplete or missing necessary information related to billing.
  Billing Plan Issues: If the billing plan is not set up correctly, it may not generate the required key date for billing.
  
  Solution:
  To resolve the AH663 error, you can take the following steps:
  
  
  Check Billing Document: Review the billing document to ensure that the key date is specified. If it is missing, you may need to enter it manually or regenerate the document.
  
  
  Review Billing Plan: Ensure that the billing plan associated with the customer or contract is correctly set up. Check if the billing frequency and key date settings are appropriate.
  
  
  Update Master Data: Verify that the customer master data and contract data are complete and contain all necessary information for billing. Update any missing fields.
  
  
  Configuration Check: If you have access to configuration settings, check the configuration for billing types and billing plans in the SAP system. Ensure that they are set up to generate key dates correctly.
  
  
  Consult Documentation: Refer to SAP documentation or help resources for specific details on how to set up month-based billing and the requirements for key dates.
  
  
  Contact Support: If the issue persists after checking the above points, consider reaching out to your SAP support team or consulting with an SAP expert for further assistance.
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as VF01 (Create Billing Document), VF02 (Change Billing Document), and VF03 (Display Billing Document) to manage billing documents effectively.
  SAP Notes: Check for any SAP Notes related to billing issues or the specific error message AH663, as they may provide additional insights or patches.
  Training and Documentation: Ensure that users involved in the billing process are trained on the correct procedures and understand the importance of key dates in billing.
  
  By following these steps, you should be able to identify the root cause of the AH663 error and implement a solution to resolve it.