Query range expressions in AX

Hi Experts,

Can anyone help me to spot the mistake in the below query range expression. I need to filter the records with transtype == payment & Last settlevoucher  is empty. 

public void init()
{
QueryBuildDataSource qbds;
QueryBuildRange qbr;

super();

qbds = this.query().dataSourceTable(tableNum(VendTrans));

qbr = qbds.addRange(fieldNum(VendTrans,LastSettleVoucher));
qbr = qbds.addRange(fieldNum(VendTrans,TransType));

qbr.value(strFmt('((LastSettleVoucher == "%1") && (TransType == %2))',
queryValue(""),
queryValue(any2int(LedgerTransType::Payment))));

qbr.status(RangeStatus::Hidden);
}