Auto Numbering in custom section
as this link
i need to make auto numbering in custom section called returns
i need to make "CASE IMPLEMENTATION ALGORITHM: SERVER-SIDE"
i made the first point "1. CREATE TWO SYSTEM SETTINGS" and created the two system settings
in the second point " CREATE A REPLACING SCHEMA OF THE [PRODUCT] OBJECT" when i create and choose the returns section as parent object it gives me an error like that :
how can i solve this ?