Negative stock in case of unrestricted-use stock

Hi all,

could you tell me negative stock in case of unrestricted-use stock?

<Example>

Prerequisites: configuration and material master setting for negative stock

Stock quantity : Batch A : 100PC (Restricted-use stock)

20PC are issued by movement type 261 in production.

In this case,

which result is correct?

<Result No.1>

Batch A :   80PC (Restricted-use stock)

<Result No.2>

Batch A : - 20PC (Un-restricted-use stock)

                 100PC (Restricted-use stock)

Actually, when I did this operation of the example,

the result was No.1.

So, does negative stock occur

when I use only stock type of quality inspection and blocked?

Best regards,

Mei