Inventory app

I need an internal inventory web-based app for ordering supplies for 3 offices. Ideally this involves: -mobile responsive, ability to add items from an ipad. -Multiple sites , able to move inventory between sites -barcode scanning preferred -up to 1000 skus -budgeting / forecasting -storage bin locations for items -ability to scan or manually enter usage -low inventory monitoring, automatically trigger new requisition -universal search by name, internal sku, vendor sku, category, vendor, price, storage bin, site location, etc -workflow: add the items to requisition(per site) => manager approval => automatically creates purchase orders for each vendor=> emails vendor if set to auto email (or manually mark "sent" if ordered online or via phone => mark as received when received => update quantities, mark back ordered items, cross check invoice pricing vs database of historic pricing (alert if price change) => automatically update inventory to reflect new stock. -keep historic data to track pricing and frequency of ordering -alerts for low inventory -monitor all inventory Tables: vendors, storage bin, locations, items, purchase orders , received orders, requisitions, users -item details: name, description, last order date, inventory per site, storage bin per site, vendor , price, internal sku , barcode, vendor sku, photo -set it up on a hosting site Milestone 1: Show front end design mockup, not functional Milestone 2: Show functioning demo of add/remove items, supplies, categories, item details, framework Milestone 3: Show fully functional app, some minor bugs allowed Milestone 4: Deploy to host and use functionally without critical bugs, meeting all interface requirements including design and fonts Mielstone 5: 30 days of constant minor tweaks and minor bug fixes.