Here are the details: I?ve got two tables, Inventory & Inventory History. Inventories can have many Inventory Histories/
The Inventory Histories table contains
Date Sent to Client (a date field)
Date Returned (a date field)
Days in Field (A duration formula)
The Inventory table contains:
Total Days in Field (a summary duration field from the Inventory History table)
Cost (a numeric currency)
Depreciation Term (days) (a duration field)
Remaining Deprecation (a numeric formula) THIS IS THE FORMULA FIELD THAT I'M TRYING TO CREATE.