You cannot modify the duration of timesheet line "%(line)s" because it has been invoiced. You cannot modify the work of timesheet line "%(line)s" because it has been invoiced. You cannot delete timesheet line "%(line)s" because it has been invoiced. To invoice work "%(work)s" you must define an account revenue for product "%(product)s". To invoice work "%(work)s" you must configure a default account revenue. There is no list price on work "%(work)s". There is no party on work "%(work)s". You cannot modify the effort of work "%(work)s" because it has been invoiced. You cannot delete work "%(work)s" because it has been invoiced. The quantity of project invoice line "%(invoice_line)s" must be "%(quantity)s".