What is Quod Ipsis Qui Contraxerunt Obstat, Et Successoribus Eorum Obstabit?

Legal Definition
That which bars those who have made a contract will bar their successors also. Dig. 50, 17, 148.
-- Black's Law Dictionary
Legal Definition
That which bars those who have contracted, themselves, will bar their successors also.
-- Ballentine's Law Dictionary