Originally, Aria's proration system on credit and charges used a rounded debit amount model in the proration calculation during processing. By default, this rounded debit amount calculation is still the set behavior used in calculating prorated service credits and charges. However, because of this default rounding behavior, in some cases, undesired 1-cent differences in the prorated amount were created after mid-period changes. So, you are given the option to either use rounded or unrounded amounts in this proration processing.
The client parameter, Proration on Credit Options, can be used to prevent 1-cent increases in prorated amounts after mid-period plan changes using selected Aria APIs including, for example, update_acct_plan_multi_m. The options for this client parameter govern whether or not the unrounded or rounded amount is used during prorated charge/credit calculations. By default, this option is set to use the rounded amount for backward compatibility.