Source list is empty on SSA page on order with configurable with custom options

[IvanPletnyov]

Preconditions

1. Magento 2 with MSI
2. Create three custom sources
3. Create custom stock with assigned created sources and assigned "main website"
4. Create configurable product with two options (black and white) with assigned custom sources.
5. On configurable product create two custom options

Steps to reproduce

1. Create order with option black and choice custom options
2. Click "Ship" button

Expected result

1. On SSA page we can see all assigned sources
2. We can create shipping

Actual result

1. On SSA page source list is empty
2. After pressing "Source selection Algorithm" button we get never ending preloader
3. We can't create shipping for order

Additional media

1. Gif
   

2. SSA page
   

3. Order
   

4. Product grid
   

5. Custom options
   

[vickdoan]

@SergeyP18 I think the issue was caused by SKU of child products. It includes the custom option SKU and the system cannot find right item.

File: Magento\InventoryShippingAdminUi\Controller\Adminhtml\SourceSelection\ProcessAlgorithm.php - the execute() function

$requestItems[] = $this->itemRequestFactory->create([
'sku' => $data['sku'],
'qty' => $data['qty']
]);

[ishakhsuvarov]

Closing, as fix is delivered to 2.3-develop branch.

Thanks @VitaliyBoyko