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

SAP Error Message - Details

• 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.

Smart SAP Assistant

• What is the cause and solution for SAP error message MM171 - Lot size dependent in-house production time will be reset ?

  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 in question. Ensure that the lot size is set correctly and is appropriate for the production process.
  Check Material Master Data: Review the material master data, especially the production and planning views. Ensure that all relevant fields are correctly filled out and consistent with the production process.
  Routing and Work Center: Verify the routing and work center associated with the material. Ensure that the production times and capacities are correctly defined.
  Recalculate Production Times: If necessary, recalculate the in-house production times based on the new lot size. This can often be done through the relevant transaction codes in SAP (e.g., C223 for routing).
  Consult Documentation: Refer to SAP documentation or help resources for specific guidance on handling this error in your version of SAP.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as MM02 (Change Material), C223 (Change Routing), and CO01 (Create Production Order) to manage material and production data.
  SAP Notes: Check for any SAP Notes related to this error message, as they may provide additional insights or patches that address known issues.
  User Forums: Engage with SAP community forums or user groups where similar issues may have been discussed, providing practical solutions from other users' experiences.
  
  By following these steps, you should be able to identify the root cause of the MM171 error and implement the necessary changes to resolve it.