QBO Troubleshooting: Business Validation Error

Introduction

This article is to guide you on what to do when faced with the following error.

Error:
Business Validation Error: Please change the tax setting to "Out of Scope" for all GST transactions dated prior to April 1, 2015. You can make this your default tax setting under Company Settings > Advanced.

Solution:
The solution is to map your tax to the correct/applicable tax code (change the 'Out of Scope' tax to 6% (if for SST in Malaysia))