Receipting payments at the account level

[Tony G. <to...@go...>]

We have what seems to be a unique requirement not handled by the common
entry-level business accounting software, so we thought we'd check the
response from the major  open source packages.

We have no trouble CREATING invoices with amounts against multiple
receivable accounts.  However, the payment receipt process ends at the
invoice level, not the account level.  So, for example, we know that
Customer X has an outstanding balances on invoices 109 and 234, but we don't
know their balance on the "Hardware sales" and "Billable services" accounts
which each of those invoices included.

Can SQL-Ledger do this?  If not, does anyone else see this as useful?