How To Fix MD128 - Start date not valid for fixed receipts

SAP Error Message - Details

• Message type: E = Error

• Message class: MD - Material Requirements Planning (MRP)

• Message number: 128

• Message text: Start date not valid for fixed receipts

What causes this issue?

You want to take firmed receipts/issues into account and have scheduled
the start of the planning period.

System Response

The start date of the planning period is valid for independent
requirements but not for firmed receipts/issue.
Otherwise, production orders, for example, could be included in the
planning run without considering the reservations earlier on the time
axis.

How to fix this error?

It is less effective to set a start date in the future that takes
firmed receipts/issues into account.
It is more effective to schedule a start date in the past if the
independent requirements in the past (but after start date) are also to
be taken into account.
If a start date is not scheduled, independent requirements in the past
are not taken into account.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message MD128 - Start date not valid for fixed receipts ?

  The SAP error message MD128 "Start date not valid for fixed receipts" typically occurs in the context of Material Requirements Planning (MRP) when there is an issue with the scheduling of fixed receipts, such as production orders or purchase orders. This error indicates that the start date for the fixed receipt is not valid based on the planning parameters or the current date.
  Causes:
  
  Invalid Date Configuration: The start date for the fixed receipt may be set in the past or outside the acceptable range defined in the MRP settings.
  Planning Parameters: The planning parameters for the material may not be set correctly, leading to conflicts in scheduling.
  Lead Times: The lead times defined for production or procurement may not align with the start date, causing the system to reject the date.
  Calendar Settings: The factory calendar or holiday settings may affect the validity of the start date.
  Material Status: The material may have a status that prevents it from being planned or produced.
  
  Solutions:
  
  Check the Start Date: Verify the start date of the fixed receipt and ensure it is set to a valid future date.
  Review MRP Settings: Check the MRP settings for the material in question, including lead times, planning strategies, and other relevant parameters.
  Adjust Lead Times: Ensure that the lead times for production or procurement are correctly defined and that they align with the planned start date.
  Factory Calendar: Review the factory calendar settings to ensure that the start date falls within the working days and does not conflict with holidays.
  Material Status: Check the material status to ensure it is not blocked or restricted from planning.
  Re-run MRP: After making the necessary adjustments, re-run the MRP to see if the error persists.
  
  Related Information:
  
  Transaction Codes: You may use transaction codes like MD04 (Stock/Requirements List) or MD02 (MRP Run) to analyze the situation further.
  MRP Configuration: Familiarize yourself with MRP configuration settings in SPRO (SAP Project Reference Object) to understand how planning parameters are set up.
  Documentation: Refer to SAP Help documentation for detailed explanations of MRP processes and error messages.
  
  If the issue persists after checking these areas, it may be beneficial to consult with your SAP support team or a functional consultant who specializes in MRP processes.