How To Fix M3112 - Previously reserved material number may not remain unfilled

SAP Error Message - Details

• Message type: E = Error

• Message class: M3 - Material Master

• Message number: 112

• Message text: Previously reserved material number may not remain unfilled

What causes this issue?

You have set an indicator that shows that the material is a reserved
material, but the material number is missing.

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?

Enter the material number externally.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message M3112 - Previously reserved material number may not remain unfilled ?

  The SAP error message M3112, which states "Previously reserved material number may not remain unfilled," typically occurs in the context of inventory management or material requirements planning (MRP) when there is an attempt to process a transaction that involves a reserved material, but the material number is not specified.
  Cause:
  
  Missing Material Number: The error usually arises when a transaction (like a goods movement, reservation, or production order) is trying to reference a material that has been reserved, but the material number field is left blank.
  Incorrect Configuration: There may be issues with the configuration of the material master or the reservation settings in the system.
  User Input Error: The user may have inadvertently not entered the material number in the relevant field.
  
  Solution:
  
  Check the Transaction: Ensure that the transaction you are trying to execute includes a valid material number. If you are creating or modifying a reservation, make sure the material number is filled in correctly.
  Review Reservations: If you are working with reservations, check the existing reservations to ensure they are correctly set up and that the material numbers are valid and available.
  Material Master Data: Verify that the material master data is correctly maintained. Ensure that the material is active and has the necessary views (like MRP, Purchasing, etc.) set up.
  User Training: If this error is frequent, consider providing additional training to users on how to properly enter data in the system to avoid missing fields.
  Debugging: If the issue persists, you may need to debug the transaction or consult with your SAP support team to identify any underlying issues in the configuration or custom code that may be causing the error.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as MB21 (Create Reservation), MB22 (Change Reservation), and MB23 (Display Reservation) to manage reservations effectively.
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message. SAP frequently updates its knowledge base with solutions for common problems.
  Documentation: Review SAP documentation related to inventory management and reservations to understand the expected behavior and requirements for material transactions.
  
  By addressing the above points, you should be able to resolve the M3112 error and ensure that material transactions are processed correctly in SAP.