Error in Tax Override in India GST for garments

We have a requirement where in India for Apparel less than Rs. 1000.00 GST has to charged at the rate of 5% and for more than Rs. 1000.00 GST has to be charged at the rate of 12%. Our Supply location is Maharashtra , hence we have configured the base taxes as follows :

After That we have created a manual collection called GST New rate where we have manually added the products whose selling price is greater than Rs. 1000.00.

After that we have configured under Taxes and Duties - Taxes and Exemptions - Product Overrides as follows:

However when I am trying to add regions , I am getting the list of regions to add as shown below

But when we are adding any region , we are getting the following error "Failed to create a new tax Override , Collection already has a Tax Override

As i am not able to enter the tax rates of other regions , my taxes are not coming correctly .

Kindly help