Which transaction code is used to validate an old material number?

The transaction code used to validate an old material number is MM03. This transaction is specifically designed to display material master data, allowing users to view the existing details of a material number without making changes. When validating a material number, it is crucial to ensure that the correct data is being referenced; MM03 enables users to retrieve and review this information easily.

By using MM03, users can check various aspects of the material, such as its description, type, unit of measure, and other key data elements stored in the material master. This process is essential in ensuring proper inventory management and accuracy in records.

The other transaction codes listed serve different functions. MM01 is used to create a new material, MM02 is for modifying existing material master data, and IW32 is associated with changing maintenance orders. Each of these has a different purpose and is not suited for merely validating an existing material number, making MM03 the optimal choice for this specific task.