How to make a custom field required in Inventory?

How to make a custom field required in Inventory?

Application: Inventory 10, 11, 12
Description: Making a custom field required in Inventory 10
Steps: 1. Go to the application server
2. Go to C:\Inetpub\wwwroot\ChemOffice\ChemInv\config
3. Open the invconfig.ini file
4. Look for the CUSTOM_FIELDS key and identify your custom field
5. Change the 0 to 1 to make it a required field
6. Save changes
7. Perform an IISReset.