def test_18_ChangeInvoiceLineAfterConfirmingAndAcceptDecision(self, quiet=quiet, run=RUN_ALL_TESTS):
    """
    Checks, that changing quantity on confirmed invoice line few times
    is possible, with accepting decision
    """
    if not run: return
    if not quiet:
      self.logMessage('Change Invoice Line after confirming and accept decision')
    sequence_list = SequenceList()
    for base_sequence in (self.PACKING_LIST_DEFAULT_SEQUENCE, ) :
      sequence_list.addSequenceString(
        base_sequence +
      """
        stepSetReadyPackingList
        stepTic
        stepStartPackingList
        stepCheckInvoicingRule
        stepTic
        stepCheckInvoiceBuilding
        stepConfirmInvoice
        
        stepTic
        stepCheckInvoiceIsSolved
        
        stepIncreaseInvoiceLineQuantity
        stepTic
        stepCheckInvoiceIsDivergent
        stepAcceptDecisionInvoice
        stepTic
        stepCheckInvoiceIsSolved
        
        stepIncreaseInvoiceLineQuantity
        stepTic
        stepCheckInvoiceIsDivergent
        stepAcceptDecisionInvoice
        stepTic
        stepCheckInvoiceIsSolved
        
        stepIncreaseInvoiceLineQuantity
        stepTic
        stepCheckInvoiceIsDivergent
        stepAcceptDecisionInvoice
        stepTic
        stepCheckInvoiceIsSolved
      """)
    sequence_list.play(self, quiet=quiet)