• Open Transaction WE30

  • In the SAP Easy Access screen, enter WE30 and press Enter.

• Choose Development Object

  • You’ll see options like:

    • Basic type

    • Extension

    • IDoc type documentation

  • Select Basic type.

• Enter a Name for the Basic Type

  • Enter a name for your new Basic Type.
    👉 Convention: Start with Z or Y (for custom objects).

• Click the “Create” Button

  • A pop-up will appear asking for the development class (package).

  • If it’s for testing only, choose $TMP (local object, not transportable).

• Define the Attributes

  • Give a short description of the Basic Type.

  • Save.

• Add Segments

  • You’ll be taken to a screen where you can assign segments.

  • To add:

    • Click Edit → Create Segment.

    • Enter an existing segment (created in WE31) or create a new one.

  • Assign the minimum and maximum occurrence (e.g., 1 for mandatory, 0..999 for optional, repeatable).

  • Build your hierarchy (parent/child segments).

• Save and Activate

  • After assigning all segments, save.

  • Then click Edit → Set Release to release the Basic Type.

In this way you can create a basic type and add the segment to it.