To see the purchase price of the product while creating Sales Invoice, please follow the below mentioned steps:
To Enable allow negative quantity, please follow the below mentioned steps:
Step 1 : Go to Settings.
Step 2 : Under General settings, Select Preferences.
Step 3 : And then under Document >> Click on Sales.
Step 5 : Scroll down and click on Save & Update.
Note : Please note that the purchase will be shown only in the Admin’s account.