Hi,
There is no option for that.
However, you can add such code at the beginning of the product / form.php view file for your backend template via the menu Display>Views:
Code:
<?php if(empty($this->product->product_id) && @$this->product->product_type != 'variant') {
$this->product->product_warehouse_id = xxx;
}
where xxx is to be replaced by the id of the warehouse.
