Where are the values defined for the customer Sales Office Drop down list?
This can be defined in System Management:
1: User Interface>Configurable Field Values> Level:System / Category: Customer Lookups / Code type: Sales Office/Sales Region.
2: Click Action>create>Test
From Enterprise:
1: Click new
2: Choose Client
3: Details Tab select drop down from the Sales Office.
4: Notice Test can now be selected from the Drop down list.