You are able to save Inbound Delivery document with zero quantity.
Reproducing the Issue
Go to Inbound Logistics work center.
Navigate to the Inbound Delivery Notifications view.
Search for the relevant delivery notification document and select it.
Choose the Post Goods Receipt button.
In Create Inbound Delivery and Goods Receipt screen under the field Actual Quantity enter the value Zero and save the document.
The system will allow you to save the Inbound delivery document without errors.
In scenarios where there are multiple items requested from the supplier and there are a few items which are not delivered by the supplier you need to be able to save your inbound delivery document with zero quantities for the not delivered items. If this option is not available you will not be able to receive the items which are sent by the supplier.
You can choose to create another Inbound document at a later time when the supplier decides to deliver the items to you.
The system is behaving as designed.
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