Salary Basis - Calculation Rule and Validation on Simple component Salary basis

Summary:

We have configured salary basis with below simple components for India -

1. Gross Salary - User entered - No Effect
2. Basic Salary (50% of Gross salary) - Add
3. House Rent Allowance (50% Basic salary) - Add
4. Leave Travel Allowance (user enters amount) - Add
5. Meal Allowance (user enters amount) - Add
6. Mobile Allowance (user enters amount) - Add
7. Provident Fund (user enters amount) - Add
8. Special Allowance - Add
9. Variable Allowance (User enters percentage) - Add
10. Fuel Allowance (user enters amount) - Add
11. Overall Salary - No Effect

We have below formula for Special Allowance component -
Simple component = Gross Salary - Basic Salary - House Rent Allowance - Mobile Allowance - Leave Travel Allowance - Fuel Allowance