When attempting to parse valid Excel formula SUM(fenia:(fenia2)) with apache.poi.ss.formula.FormulaParser.parse it throws exception: org.apache.poi.ss.formula.FormulaParseException: Parse error near char 10 '(' in specified formula 'SUM(fenia:(fenia2))'. Expected number, string, defined name, or data table fenia and fenia2 in the formula are defined named ranges.