In this video, we are discussing about the purchase agreement type Blanket Order. Blanket orders are long-term agreements between a company and a vendor to deliver products on a recurring basis with predetermined pricing. Your company should consider using them when you frequently purchase the same products from the same vendor in varying quantities and/or at different times. #odootutorials. Blanket orders are long-term agreements between a company and a vendor to deliver products on a recurring basis with predetermined pricing. Your company should consider using them when you frequently purchase the same products from the same vendor in varying quantities and/or at different times.