I have various taxes accumulating in liability accounts 2210 and 2215.
  The time has come for me to send some of this money to the gub'mint
and thus reduce my liabilities.  I have created a creditor record for
the government department in question.  However, if I go to create an
AP transaction, I don't have the opportunity to select any liability
accounts.
What I want to do is to write a cheque and record in LedgerSMB that I
have decreased the liabilities recorded in these two accounts.  How do
I do it?
I run sql-ledger, but unless i missed something, I do not think this is different under LSMB: