Why is the pancreas considered part of the endocrine system

The Pancreas is a glandular organ in the upper abdomen, but really it serves as two glands in one: a digestive exocrine gland and a hormone-producing endocrine gland. Functioning as an exocrine gland, the Pancreas excretes enzymes to break down the proteins, lipids, carbonhydrates, and nucleic acids in food.