from
Bouvier's Law Dictionary, Revised 6th Ed (1856)
ACTIONS RESCISSORY, Scotch law. Are divided into, 1, Actions of proper
improbation; 2, Actions of reduction-improbation; 3, Actions of simple
reduction. Ersk. Pr. L. Scot. 4 1, 5,
2.-1. Proper improbation is an action brought for declaring writing
false or forged.
3.-2. Reduction-improbation is an action whereby a person who may be
hurt, or affected by a writing, insists for producing or exhibiting it in
court, in order to have it set aside or its effects ascertained, under the
certification, that the writing if not produced, shall be declared false and
forged.
4.-3. In an action of simple reduction, the certification is only
temporary, declaring the writings called for, null, until they be produced;
so that they recover their full force after their production. Ib. 4, 1, 8.