How To Fix TU179 - You cannot enter days as period length

TU179 - Overview

• Message type: E = Error

• Message class: TU - Billing/Scheduling/Budget Billing

• Message number: 179

• Message text: You cannot enter days as period length

What causes this issue?

You have specified the period length in months. You are therefore not
required to enter the number of days.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

TU179 - Details

• The SAP error message TU179, which states "You cannot enter days as period length," typically occurs when you are trying to define a period length in a context where only months or years are acceptable. This error is often encountered in various SAP modules, particularly in the context of time-related configurations, such as in the planning or scheduling of activities.
  
  Cause:
  The primary cause of this error is that the system is expecting a period length defined in months or years, but the user has attempted to enter a value in days. This can happen in various scenarios, such as:
  
  When configuring planning periods in SAP modules like SAP Controlling (CO) or SAP Project System (PS).
  When setting up time-based parameters in other modules where the system does not support day-level granularity.
  
  
  Solution:
  To resolve the TU179 error, you should:
  
  
  Check the Configuration: Review the configuration settings where the error occurred. Ensure that you are using the