The "Counters" screen registers and changes counters. Additional business rules can use a counter to calculate a sequence number. See [[Invantive Estate/Subjects/Advanced/Additional Business Rules|Additional Business Rules]]. Invantive Estate creates a database sequence for each counter. The name of the database sequence equals the code of the counter. A calculated field can request the next value of the counter as `<CODE>.nextval`. The entry fields are: - "Code": The unique code of the counter. - "Description": The description of the counter. - "Starting Value": The initial value of the counter. - "Value Increase": The value by which the counter increases each time. - "Size of Cache": The size of the cache of the counter. The size is adjustable to avoid large gaps between successive counter values. The other fields are: - "Name": The name of the counter. - "Counter": The code of the counter. - "Minimum": The minimum value of the counter. - "Maximum": The maximum value of the counter. - "Cycle": When checked, the counter gets the first value again after exceeding the maximum value. - "Ordered": Indicates whether the values of the counter are ordered. - "Size of Cache": The size of the cache memory. - "Last Value": The last value of the counter.