CayERP solution we build for utility and service based companies. This solution avail all features as below:

Purchasing
Job Management
Inventory
Technician scheduling
Timesheet Management

Purchasing module has options to create PO online from anywhere, reserve PO, user can create Purchase requests and manage purchase requests also user can see item details we have implemented this item maintenance functionality.
Shipping module has containers management functionality where users can declare and clear purchase orders and imported data to containers from purchase orders. Receiving module has functionality like receive purchase orders, receive items, manage transfers etc.
Job management module is web based system for user where user can create jobs, projects, locations and assign that to technicians where technicians can work on jobs in real time and update status online.
Inventory module has functionality to manage products inventory, products maintenance, products Lookup etc.
This application implemented using role base security. We build this project end to end from scratch, involved in all steps and still we are working on this project and adding requirements day by day.