public async Task <IActionResult> CreateConstructorInvoices([FromBody] InvoiceConstructorViewModel model)
        {
            try {
                if (!ModelState.IsValid)
                {
                    throw new Exception("Form is not valid!");
                }
                var result = await _businessManager.CreateInvoiceDraft(_mapper.Map <InvoiceConstructorDto>(model));

                if (result == null)
                {
                    return(NotFound());
                }

                return(Ok(_mapper.Map <InvoiceConstructorViewModel>(result)));
            } catch (Exception er) {
                return(BadRequest(er.Message ?? er.StackTrace));
            }
        }