Sketch/Wireframes and Database Structure

Financial & Accounting:
Chart of Accounts
Journal Entries and Posting
AR/AP
Cash/Bank
Invoices/Receipts
VAT / Taxes
Closing
Reports Trial Balance, General Ledger, AP/AR Aging

Procurement:
Vendors
Purchase Requisition
Purchase Order
GRN / Receiving
Vendor Invoice
Returns to Vendor
Payment to Vendor link with AP/Bank

Inventory / Warehouse:
Items / Products + Units + Barcodes
Warehouses / Locations / Bins
Stock Movements
Stock in/out, Transfers
Adjustments
Batches / Expiry
Min/Max + Reorder level
Costing method (FIFO/Weighted Avg)
Reports: Stock Balance, Expiry Report, Movement report