			String fieldTypes[] = new String[inputFieldTypes.length + 1];
			for(int i=0;i<inputFieldNames.length;i++){
				fieldNames[i]=inputFieldNames[i];
				fieldTypes[i]=inputFieldTypes[i];
			}
			fieldNames[inputFieldNames.length] = "_accumulator";
			fieldTypes[inputFieldNames.length] = "Object";
			expressionWrapper.getValidationAPI().init(fieldNames,fieldTypes);