[FIX] account, stock: date invoice for a refund

When a a refund is created from an open invoice and a different
date than today is selected as refund date, the invoice date of
this refund must be the selected date.

opw:673369

addons/account/wizard/account_invoice_refund.py

@@ -92,7 +92,7 @@ class AccountInvoiceRefund(models.TransientModel):
                         tax_lines = inv_obj._refund_cleanup_lines(tax_lines)
                         invoice.update({
                             'type': inv.type,
-                            'date_invoice': date,
+                            'date_invoice': form.date_invoice,
                             'state': 'draft',
                             'number': False,
                             'invoice_line_ids': invoice_lines,

addons/stock_account/stock_account.py

@@ -106,7 +106,7 @@ class account_invoice(osv.osv):
         return []
 
     def _prepare_refund(self, cr, uid, invoice, date_invoice=None, date=None, description=None, journal_id=None, context=None):
-        invoice_data = super(account_invoice, self)._prepare_refund(cr, uid, invoice, date, date,
+        invoice_data = super(account_invoice, self)._prepare_refund(cr, uid, invoice, date_invoice, date,
                                                                     description, journal_id, context=context)
         #for anglo-saxon accounting
         if invoice.company_id.anglo_saxon_accounting and invoice.type == 'in_invoice':