(1) The pledgee is to warn the owner of the sale in advance and at the same time specify the amount of money for which the sale is to take place. The warning may be given only after the right of sale has arisen; it may be omitted if it is inadvisable.
(2) The sale may not be effected until after the expiry of one month after the warning. If the warning is inadvisable, the month is calculated from the time when the right of sale arises.