There are two codes of Schema.org on product pages of an ecommerce website. First is http://schema.org/Store that includes store info. Another one http://schema.org/Product for product info.
Are two codes necessary on product pages? Because as of now with two codes i.e. one for store & another for product, there are no rich snippets showing up in SERPs.
What is or isn’t necessary for getting rich results is typically documented by the search engine service.
In case a rich result only needs a Product item, it doesn’t mean that you can’t also have a Store item. If a rich result doesn’t get displayed, it typically results from missing information, not from too much information.
Having a Store item can be beneficial for many reasons. It allows you to convey who is offering the Product (Store makesOffer Offer), what else is offered by the store, where the store is located, etc.
