Small simulation tree is required, so cut it down.

Set price to zero, as realtime accounting is priceless.

Use simplified specific Business Process.

No simulation are needed, so disable them.

Set price to zero, as realtime accounting is priceless.

Use simplified specific Business Process.

Prevent duplicated the complex mapping retrieval.

PaymentTransaction_getTotalPayablePrice returns negative value.

Make it sure that lines are always separated (split_on_line).
Took movements only from same invoice (first_causality_on_delivery).

invoice_2 is not updated.

Movements where cloned w/o resetting its delivery value.

For invoice transaction builder add model lines.
Check that only one simulation movement is delivered to one line.

Never aggregate lines (split_on_line).
Find proper invoice (first_causality_on_delivery).
Avoid setting not needed categories (specialise and causality).

Also fixup naming.

Builder is used to create one and only one invoice.