Machine 1 uses the material from a batch that has already been used up

I have found a possible bug in Actyx-Academy Implementation

Machine 1 uses the material from a batch that has already been used up.

**Steps to reproduce:**

Create Production Order for 'Machine 1' in Production Order System on http://localhost:1234

- Article: 12345-A
- Amount: 30
- Machine: Machine 1

**Expected output:**

start button should be disabled or the machine stops to use batch wenn it is empty

**Actual output:**

Machine use material that does not exist. In Production Order System > Tab Baches: available material is displayed as -5