Added working_title to Product variants list
Added info_table to the schema. refs #18655
Removed var_dump from DiscountField
Fixed merge conflict by cherry-pick
Fixed merge conflict by cherry-pick
Set usage limit of voucher to 1. refs #17399
Replace i, 1, l also in code generation. refs #17399
Dont use current year, but year invoice was created for invoice number. refs #17295
Allow value null for product_cover_id. refs #19365