private void collectGroupExpressions(final Node[] nodes, final List expressions, final FormulaParser parser, final Expression reportFunctions[])
{
for (int i = 0; i < nodes.length; i++)
{
final Node node = nodes[i];
if (node instanceof OfficeGroup)
{
final OfficeGroup group = (OfficeGroup) node;
final FormulaExpression exp = (FormulaExpression) group.getGroupingExpression();
if (exp == null)