In case you have deleted a product (by mistake or not) and have orders to fulfill; here are two solution to deal with the problem

Edit the order
On the right side of the order, click on Action

Select Edit

Copy the AliExpress link of the product you deleted (or of another supplier who sells the same product)

After that, do as Follow: -Select the correct variants -Select a Shipping Method
-Save

You will then be able to process the order and place it to AliExpress!
Re-import the product
If the solution didn't work for some reason, you can do as follow
1 - Re-import the product on DSers
You need to reimport the product that you deleted to DSers
2 - Push the product to Shopify
Once you have imported the product to DSers, you need to Push/Publish that product to your Shopify store
3 - Duplicate the order in Shopify
After the product is Pushed / Published from DSers to Shopify, you need to go on Shopify and duplicate the original order.
-Open the order
-In the order, click Duplicate

This article from Shopify can help you if you are struggling
https://help.shopify.com/en/manual/orders/create-orders#duplicate-an-existing-order
4 - Remove the item from the duplicated order in Shopify
If the product is still in the duplicated order, make sure you delete it
5 - Search the product you just pushed to Shopify
Look for the newly re-added product, and add it to your order. Make sure you select the right variant

6 - After you added the product to the duplicated order
It will create a draft order.
You need to validate it by marking the order "as paid"

The duplicated order will then sync to DSers automatically and you will be able to place the order to AliExpress normally
7 - Manually fulfill the original order
To avoid placing the same order twice, you should manually fulfill the original order on Shopify

The order will synchronize as Fulfilled on DSers as well.
Don't hesitate to contact us if you have any questions!