Кстати, можно использовать Base Enum непосредственно в тексте запроса, т.е
X++:
value = strfmt('((%1 == LedgerJournalACType::Bank) || ' +
'((%2 == LedgerJournalACType::Cust) && (%3 == LedgerJournalACType::Bank)))',
fieldId2name(TableNum(LedgerJournalTrans), fieldNum(LedgerJournalTrans, AccountType)),
fieldId2name(TableNum(LedgerJournalTrans), fieldNum(LedgerJournalTrans, AccountType)),
fieldId2name(TableNum(LedgerJournalTrans), fieldNum(LedgerJournalTrans, OffsetAccountType)));