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

AH663 - Overview

• 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