[FIX]account_patment : Fixes the IntegrityError Problem

lp bug: https://launchpad.net/bugs/986088 fixed

bzr revid: amb@tinyerp.com-20120424054359-l0pa8rij04x63k42

addons/account_payment/wizard/account_payment_order.py

@@ -87,7 +87,7 @@ class payment_order_create(osv.osv_memory):
                     'partner_id': line.partner_id and line.partner_id.id or False,
                     'communication': line.ref or '/',
                     'date': date_to_pay,
-                    'currency': line.invoice and line.invoice.currency_id.id or False,
+                    'currency': line.invoice and line.invoice.currency_id.id or line.company_id.currency_id.id,
                 }, context=context)
         return {'type': 'ir.actions.act_window_close'}
 
@@ -119,4 +119,4 @@ class payment_order_create(osv.osv_memory):
 
 payment_order_create()
 
-# vim:expandtab:smartindent:tabstop=4:softtabstop=4:shiftwidth=4:
+# vim:expandtab:smartindent:tabstop=4:softtabstop=4:shiftwidth=4: