When you create a new production order from a sales order line, the marking and the references between sales line and production order are set automatically.
But in the new functionality that allows the creation of a transfer order from a sales order line, no marking is created, and there is no protection against creating a double transfer order.
Automatic marking of transfer orders created from sales lines should at least be possible through a parameter setting.
For each sales line, a new transfer header and 1 transfer line is created.
In the dialog, when you choose the from-warehouse, and there is already one open (not released) transfer order, there should be an option to add the new transfer line to the existing transfer order.