Hi,
Is there any way to update the onhand qyt in a MasterStockItem from the SDK?
I'm guessing you want to make an Inventory Adjustment.
It is not currently possible to generate Inventory Adjustments with the .NET SDK. Indeed, you cannot even read these entities as of today.
You may be able to use the COM API to introduce an Inventory Adjustment.
*Community Hub is the new name for Sage City