Section 14. Assignment of lien

A lien, filed as prescribed in this article,
  may  be  assigned by a written instrument signed and acknowledged by the
  lienor, at any time before the discharge thereof. Such assignment  shall
  contain  the names and places of residence of the assignor and assignee,
  the amount of the lien and the date of filing the notice of lien, and be
  filed in the office where the notice of the lien assigned is filed.  The
  facts relating to such an assignment and the names of the assignee shall
  be entered by the proper officer in the book where the notice of lien is
  entered and opposite the entry thereof. Unless such assignment is filed,
  the  assignee  need  not be made a defendant in an action to foreclose a
  mortgage, lien or other incumbrance. A payment made by the owner of  the
  real  property  subject  to  the  lien  assigned  or  by  his  agent  or
  contractor, or by  the  contractor  of  a  public  corporation,  to  the
  original  lienor,  on  account  of  such  lien,  without  notice of such
  assignment and before the same is filed, shall  be  valid  and  of  full
  force  and  effect.  Except  as  prescribed  herein,  the validity of an
  assignment of a lien shall not be affected by  a  failure  to  file  the
  same.