there are 3 flix fields are there

1.arta flexfield

2.salestax flexfileld

3.territory flexfield

1. Accounting

2. Sales Tax Location

3. System Items

4. Territory

their are 4 flexfields are in AR

1. Accounting flexfield

2. sales tax flexfield

3. Territory flexfiled

4. system items

Required Key Flex fields:

1. Territory Flex field

2. Sales Tax Location flex field

Optional Key Flex fields:

1. Transaction flex field (requied only if Auto Invoicing is enabled)

2. System Items Flex field (If Inventory or OM is installed this should be defined there. other wise it should be set up in AR).