# DB01003: Transaction Failed

## What This Means[​](#what-this-means "Direct link to What This Means")

A database transaction could not be completed. Transactions group multiple operations together — if any part fails, everything is rolled back to maintain data integrity.

## Common Causes[​](#common-causes "Direct link to Common Causes")

* **Concurrent access** — Multiple operations trying to modify the same data
* **Storage full** — No space to write new data
* **Database locked** — Another process is locking the database
* **Power interruption** — Operation interrupted unexpectedly

## How to Fix[​](#how-to-fix "Direct link to How to Fix")

### 1. Retry the Operation[​](#1-retry-the-operation "Direct link to 1. Retry the Operation")

The issue may be temporary:

* Wait a moment
* Try the operation again
* Avoid rapid repeated attempts

### 2. Check for Conflicts[​](#2-check-for-conflicts "Direct link to 2. Check for Conflicts")

If multiple devices or tabs are open:

* Use one instance at a time
* Close duplicate browser tabs
* Coordinate multi-device usage

### 3. Check Storage Space[​](#3-check-storage-space "Direct link to 3. Check Storage Space")

Ensure there's space for data:

* Check available disk space
* Free up space if needed
* Clear browser cache (web version)

### 4. Restart the Application[​](#4-restart-the-application "Direct link to 4. Restart the Application")

Reset the database state:

1. Close the POS completely
2. Wait a few seconds
3. Reopen the application

### 5. Clear and Re-sync[​](#5-clear-and-re-sync "Direct link to 5. Clear and Re-sync")

If transactions consistently fail:

1. Clear local data
2. Login again
3. Sync fresh from server

## Transaction Safety[​](#transaction-safety "Direct link to Transaction Safety")

WCPOS uses transactions to ensure:

* Data consistency
* Complete operations (all or nothing)
* Protection against partial updates

When a transaction fails, your data remains consistent.

## Related Errors[​](#related-errors "Direct link to Related Errors")

* [DB01001](/error-codes/DB01001.md) — Connection Failed
* [DB02003](/error-codes/DB02003.md) — Constraint Violation