Invoice as writtenOff, the debt unable to be collected.
Input
srd: sparse response description, a SOAP string (which must be a JSON object), in which you specify the elements you want returned.This parameter enables the calling system to constrain amethod call to return only components you specify. This gives you greater control over returned content, and improves response time within the Vindicia platform by reducing the processing needed for the call.
Some fields are required, either practically or in the WSDL, and will be returned regardless of the srd. A null srd returns the complete response.
autobill: the AutoBill associated with the Invoice to be written off.
invoiceId: the ID of the Invoice to write off.
Output
return: an object of typeReturn that indicates the success or failure of the call.

