We can set default ‘inventory location’ in Inventory items form.
It will be helpful to set a default Inventory Location in Purchase Invoices and Sale Invoices. Maximum time we use a location as Master/Main location with other Optional locations. Settings the Main location as Default will help.
Your goal is not clear, because you are not using the terminology of the program. There is nothing in Manager named either “Purchase Inventory” or “Sale Inventory.” What are you referring to?
The Inventory location field on the invoice (and, therefore, the form default) appears only after an inventory item has been selected. So, to set a default location, you would need to:
Go to Form Defaults.
For the transaction type where you want to set the default, click Edit.
On a line item, choose any inventory item.
When the Inventory location field appears, choose your Main location.
Delete the inventory item from #3 above.
Click Update.
Although no longer visible, the default inventory location will be saved and will appear when creating an invoice, after the first inventory item is chosen. It can be edited there.