In their supply chain network, companies may have several customers and suppliers.
When they sign a contract with a customer for a specified scope of supply, they will create a project to coordinate the work for the contract. This correspond to a 'project' in NotifyMe.
For a specified project, they may need to issue a purchase order to each of the suppliers that contribute to the overal scope of supply, or a production order to organize the work performed internally by the company. This correspond to a 'package' in NotifyMe.
In other words, a 'package' corresponds to a purchase order to a specified supplier (or to a production order when the work is carried out directly by the company). Several packages related to the same contract with a customer are grouped in a 'project'.