How To Fix MM171 - Lot size dependent in-house production time will be reset

MM171 - Overview

• Message type: E = Error

• Message class: MM - Messages for material master maintenance and Customizing

• Message number: 171

• Message text: Lot size dependent in-house production time will be reset

What causes this issue?

You have specified a lot size <ZH>independent</> in-house production
time. A lot size <ZH>dependent</> in-house production time was
previously assigned to the material.

System Response

The system cancels the lot size dependent in-house production time.

How to fix this error?

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

Error message extract from SAP system. Copyright SAP SE.

MM171 - Details

• The SAP error message MM171, which states "Lot size dependent in-house production time will be reset," typically occurs in the context of Material Management (MM) and Production Planning (PP) modules. This message indicates that the in-house production time for a material is being reset due to changes in the lot size settings or other related parameters.
  
  Cause:
  
  Lot Size Changes: The error often arises when there is a change in the lot size settings for a material. If the lot size is modified, the system may need to recalculate the in-house production time based on the new lot size.
  Master Data Changes: Changes in the material master data, such as production versions, routing, or work center settings, can also trigger this message.
  
  Configuration Issues: Incorrect configuration in the production planning settings or master data can lead to inconsistencies that result in this error.
  
  
  Solution:
  
  Review Lot Size Settings: Check the lot size settings for the material