BBD registration? Productions dates and best before dates can be registered at article level in CORAX. In addition, CORAX also offers the possibility to record total shelf life at item level and the minimum required shelf life of the item upon delivery. Based on the production date of an item, CORAX calculates the best before date. It can be registered that a customer will never receive an item with an expiration date older than the previous delivery with a customer-level tool in CORAX.