Field Name	Field Type	Field Constraints	Field Notes
Source	InventorySource		The inventory source identifying which container this action targets.
Slot	unsigned varint	<div style="padding-left: 0px;">Minimum = 0</div>	The slot index within the source container.
From Item	NetworkItemStackDescriptor		The item descriptor representing the state of the slot before this action.
To Item	NetworkItemStackDescriptor		The item descriptor representing the desired state of the slot after this action.