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

SAP Error Message - Details

• 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.

Smart SAP Assistant

• What is the cause and solution for SAP error message TU179 - You cannot enter days as period length ?

  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 correct units for the period length. If the system requires months or years, convert your days into the appropriate unit.
  
  
  Adjust Input Values: If you have mistakenly entered a value in days, change it to months or years as required by the specific field or configuration.
  
  
  Consult Documentation: Refer to the SAP documentation or help files related to the specific module you are working in. This can provide insights into the expected formats and units for period lengths.
  
  
  Seek Help from SAP Support: If you are unsure about the correct configuration or if the error persists after making adjustments, consider reaching out to your SAP support team or consulting SAP Notes for any known issues related to this error.
  
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any updates or patches related to this error message. Sometimes, specific versions of SAP may have known issues that are documented in SAP Notes.
  User Forums: Engage with SAP community forums or user groups where similar issues may have been discussed. Other users may have encountered the same error and can provide insights or solutions.
  Training and Documentation: If you frequently work with configurations that involve period lengths, consider additional training or reviewing SAP's official training materials to better understand the requirements and limitations.
  
  By following these steps, you should be able to resolve the TU179 error and proceed with your configuration or data entry in SAP.