Assembly Item Cannot Be Added to Sales Order - "Please enter line item" Error

Hello NetSuite Community,

I'm a developer (not a functional user) facing an issue when trying to create Sales Orders with Assembly/Build items, both via RESTlet API and manually through the UI.

**The Problem:**

When I try to add an Assembly item to a Sales Order:

1. **Via RESTlet/API (Postman):**

```json

{

"success": false,

"message": "Error in item 1: Item 3837 (BIFASICO ANTI-FRIZZ X 110 ML) is Assembly/Build type. NetSuite does not allow adding Assembly items directly to Sales Orders."

}