generateAndSaveXml method
Generates the XML file for the credit note and saves it to a file.
This method is used to generate the XML representation of the credit note and save it
to a file with the given fileName
. If the supplier information is missing, an exception
will be thrown.
Returns the file path where the XML is saved or null
if the file could not be saved.
Implementation
Future<String?> generateAndSaveXml(String fileName) async {
// if (supplier != null) {
// return null;
// }
return await saveToFile(toXml(), fileName);
}