  Tolerance relations were investigated by several authors in various algebraic
structures, see e.g. the monograph by I. Chajda. Recently G. Cz\'edli studied
so-called 2-uniform tolerances on lattices, i.e. tolerances that are compatible
with the lattice operations and whose blocks are of cardinality 2. He showed
that two such tolerances on a lattice containing no infinite chain permute if
and only if they are amicable (a concept introduced in his paper). We extend
this study to tolerances on posets. Since in posets we have no lattice
operations, we must modify the notion of amicability. We modified it in such a
way that in case of lattices it coincides with the original definition. With
this new definition we can prove that two tolerances on a poset containing no
infinite chain permute if and only if they are amicable in the new sense.
