Currently opening balances are fetched from iFinance at the Document Preview stage (and then hardcoded to the final bill). If there is a delay (ie.for bill checking) between the Document Preview stage and actually issuing bills a few days later and a parent has made a payment during this time, the opening balance on the final bill is incorrect. (We forward date the bill run to the date the bill is actually issued)
It would be helpful to have the option to refresh the opening balances at the document publishing stage.