Where a real burden is reallotted under section 18, 19, 20 or 23 of this Act, the right to enforce the burden shall be subject to any counter-obligation (modified as the case may be by the agreement or by the order of the Lands Tribunal) enforceable against the superior immediately before (as the case may be) the nominated land, the prospective dominant tenement, the land benefited, the heritable property or the land to which services are provided becomes the dominant tenement.