In Odoo first we create existing own module and inherits the account invoice object in your own module. Than fetch all object like as a account.move , account.journal, account.period in your own module and update the account.journal and also invoice_id in your existing module. Than get all the Documents for a Partner and each document and Pay only selected documents and create a single receipt. And the Add Journal Entries than customer make final payments in particular customer.

Using this function given below

@api.multi
def payment_invoice(self, cr, uid, ids, context=None):
         if not context:
             context = {}
         ctx = context.copy()
         invoice_object = self.browse(cr,uid,ids[0])
         voucher_id = False
         invoice_number = invoice_object.number
         voucher_pool = self.pool.get('account.voucher')
         journal_pool = self.pool.get('account.journal')
         period_obj = self.pool.get('account.period')
         if ctx.get('journal_type',''):
            bank_journal_ids=  journal_pool.search(cr, uid, [('type', '=', context.get('journal_type'))])
         else:
            bank_journal_ids = journal_pool.search(cr, uid, [('type', '=', 'bank')])
         if not len(bank_journal_ids):
             return True
         ctx.update({
                 'default_partner_id': invoice_object.partner_id.id,
                 'default_amount': invoice_object.amount_total,
                 'default_name':invoice_object.name,
                 'close_after_process': True,
                 'invoice_type':invoice_object.type,
                 'invoice_id':invoice_object.id,
                 'journal_id':bank_journal_ids[0],
                 'default_type': invoice_object.type in ('out_invoice','out_refund') and 'receipt' or 'payment'
         })
         if invoice_object.type in ('out_refund','in_refund'):
             ctx.update({'default_amount':-invoice_object.amount_total})
         tax_id = self._get_tax(cr, uid, context)

         account_data = self.get_accounts(cr,uid,invoice_object.partner_id.id,bank_journal_ids[0])
         date = time.strftime('%Y-%m-%d')
         voucher_data = {
                 'period_id': invoice_object.period_id.id,
                 'account_id': account_data['value']['account_id'],
                 'partner_id': invoice_object.partner_id.id,
                 'journal_id':bank_journal_ids[0],
                 'currency_id': invoice_object.currency_id.id,
                 'reference': invoice_object.name,
                 'amount': ctx.get('amount',0.0),
                 'type':account_data['value']['type'],
                 'state': 'draft',
                 'pay_now': 'pay_later',
                 'name': '',
                 'cheque_number' : ctx.get('cheque_number',0.0),
                 'bank' : ctx.get('bank', ''),
                 'branch' : ctx.get('branch', ''),
                 'chq_date' : ctx.get('chq_date', time.strftime('%Y-%m-%d')),
                 'date': time.strftime('%Y-%m-%d'),
                 'company_id': self.pool.get('res.company')._company_default_get(cr, uid, 'account.voucher',context=None),
                 'tax_id': tax_id,
                 'payment_option': 'without_writeoff',
                 'comment': _('Write-Off'),
             }
         if invoice_object.type in ('out_refund','in_refund'):
             voucher_data.update({'amount':-invoice_object.amount_total})
         if not voucher_data['period_id']:
             period_ids = period_obj.find(cr, uid, invoice_object.date_invoice, context=context)
             period_id = period_ids and period_ids[0] or False
             voucher_data.update({'period_id':period_id})
         voucher_id = voucher_pool.create(cr,uid,voucher_data)
         if voucher_id:
             if invoice_object.type in ('out_refund','in_refund'):
                 amount=-invoice_object.amount_total
                 res = voucher_pool.onchange_partner_id(cr, uid, [voucher_id], invoice_object.partner_id.id, bank_journal_ids[0], amount, invoice_object.currency_id.id, account_data['value']['type'], date, context=context)
             else:
                 res = voucher_pool.onchange_partner_id(cr, uid, [voucher_id], invoice_object.partner_id.id, bank_journal_ids[0], invoice_object.amount_total, invoice_object.currency_id.id, account_data['value']['type'], date, context=context)
             for line_data in res['value']['line_cr_ids']:
                 if line_data['name'] in [invoice_number]:
                     voucher_lines = {
                         'move_line_id': line_data['move_line_id'],
                         'amount': ctx.get('amount',0.0),
                         'name': line_data['name'],
                         'amount_unreconciled': line_data['amount_unreconciled'],
                         'type': line_data['type'],
                         'amount_original': line_data['amount_original'],
                         'account_id': line_data['account_id'],
                         'voucher_id': voucher_id,
                     }
                     voucher_line_id = self.pool.get('account.voucher.line').create(cr,uid,voucher_lines)
             for line_data in res['value']['line_dr_ids']:
                 if line_data['name'] in [invoice_number]:
                     voucher_lines = {
                         'move_line_id': line_data['move_line_id'],
                         'amount': ctx.get('amount',0.0),
                         'name': line_data['name'],
                         'amount_unreconciled': line_data['amount_unreconciled'],
                         'type': line_data['type'],
                         'amount_original': line_data['amount_original'],
                         'account_id': line_data['account_id'],
                         'voucher_id': voucher_id,
                     }
                     voucher_line_id = self.pool.get('account.voucher.line').create(cr,uid,voucher_lines)
             voucher_pool.action_move_line_create(cr,uid,[voucher_id])

         return voucher_id