Section 1903. Limitations 1

Unless  a  proceeding  under this article to satisfy a debt of the
  decedent is brought within 18 months from the  date  when  letters  were
  issued  to  the  original fiduciary and unless such letters were granted
  within 2 years after the date of the death of the decedent the title  of
  a purchaser or mortgagee from the distributee or devisee of the decedent
  which  was  acquired  before  the  proceeding  was  instituted cannot be
  affected in any way by the proceeding.
    2. A proceeding under this article  to  satisfy  any  debt  cannot  be
  maintained when the real property is exempt by law from levy and sale by
  virtue of an execution.
    3.  A  proceeding  under this article to satisfy a legacy expressly or
  impliedly charged on the real property  must  be  instituted  within  10
  years from the date of the death of the decedent.