Business context
Trading businesses often run sales, stock books and cash records in separate tools. When the connection fails, staff either stop working or invent parallel paper trails that never reconcile.
Work
CMDS
Offline-first Windows desktop ERP for trading counters and branches — inventory, sales, purchasing, payments, expenses and reporting. Release Candidate v1.0.0.
Commercial Desktop ERPWindows desktopRelease candidate
Overview
- Built for distributors and retailers whose counters cannot stop when the network drops.
- Sales documents, warehouse movements, payments and expenses share one local SQL Server database.
- Designed so a later sync service can consolidate branches without rewriting the core.
- Release Candidate v1.0.0 — feature-complete for target workflows and under active hardening.
Problem
Stock quantities, invoices and cash collections lived in different places, so nobody could trust the end-of-day position. Manual re-entry after outages created differences discovered only during counts or collection disputes.
Intended users
- Counter and branch sales staff issuing invoices and returns
- Warehouse keepers receiving, transferring and adjusting stock
- Cashiers recording customer and supplier payments
- Owners reviewing daily sales, stock and cash reports
Core capabilities
Document-driven stock
Every quantity change is posted through a typed document so inventory always explains itself from movement history.
Counter-speed sales
Fast invoice entry with live availability, permitted pricing and immediate balance impact on the local database.
Treasury linkage
Receipts and payments attach to open party balances so cash and receivables reconcile to documents.
Main modules
- Product and unit master
- Customers and suppliers
- Sales and purchase documents
- Warehouse movements
- Payments and expenses
- Operational reports
Technology stack
.NET 8 · WPF · SQL Server · EF Core
Architecture summary
- WPF desktop client with clear separation of views, view models and services
- Application services owning validation, permissions and posting rules
- EF Core against SQL Server with parameterized access and explicit constraints
- Transactional posting for every stock or balance-changing operation
- Localization resources for Arabic and English UI text and print layouts
Security considerations
- Role-based permissions enforced in application services
- Activity logging for posting, cancellation, price overrides and stock adjustments
- Parameterized data access on every query and command
- Soft cancellation records for posted documents instead of hard deletes
- Documented SQL Server backup expectations as part of handover
Interface gallery
Current phase
CMDS is an EH DESIGN product initiative at Release Candidate v1.0.0. Target workflows are feature-complete and under hardening. No client deployment, revenue or performance results are claimed.
Scope boundaries
- Not a full statutory accounting suite unless separately scoped
- No implied multi-country tax compliance out of the box
- Mobile and web portals are separate product paths
- Optional central sync is not claimed as universally deployed
Remaining work
- Hardening and packaging for staged rollout of v1.0.0
- Operator documentation and installation runbooks
- Optional sync service scoping when a deployment needs it
- Additional report packs requested during acceptance
Main workflows
Sales and returns
Select customer, add lines with stock visibility, apply permitted pricing, post the invoice or return and update balances in one transaction.
Purchasing and receiving
Register the supplier document, receive quantities into a warehouse and record the payable amount against the party.
Payments and expenses
Record receipts and payments against customers or suppliers, and capture operating expenses with accountable categories.
End-of-day review
Operators run sales, stock movement, collection and expense reports; differences point back to the posting document.
Technical decisions
Desktop first, not cloud first
Warehouse and counter connectivity is inconsistent. A local client and database keep operations running; sync can be added later without redesigning the core.
Derived balances
Stock and party balances are computed from movements so silent drift from editable totals is eliminated.
One document engine
Sales, purchases, returns, transfers and adjustments share validation and posting instead of duplicating rules per screen.
Service-layer authorization
UI restrictions help usability; trusted control blocks restricted operations in the service layer.
Testing approach
- Unit tests around stock movement, pricing and balance calculation
- Scenario tests for full document lifecycles including returns and cancellations
- Transaction rollback verification on forced posting failures
- Manual acceptance passes against realistic counter and warehouse scenarios
- Report reconciliation against underlying document records
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