Message workflow for cash balances?

Hi

Is there an area of the protocol, or any message types, that would be suitable for notifying counterparties of their current cash balance?

The idea is to send unsolicited updates whenever there is a change in the current or forward cash balance.
Thanks

Do you mean cash in terms of collateral being posted? Then have a look at the CollateralReport(35=BA) or AccountSummaryReport(35=CQ) message.