Section 703. Method of Enforcing Charges.--Any charge assessed against a unit may be enforced by suit by the council acting on behalf of the unit owners in an action in assumpsit: Provided, That each suit when filed shall refer to this act and to the unit against which the assessment is made and the owner thereof and shall be indexed by the prothonotary as lis pendens. Any judgment against a unit and its owner shall be enforceable in the same manner as is otherwise provided by law.