The pair will compete in the CSI4* along with other stars like new world number three Gerco Schröder, Marcus Ehning, Luciana Diniz and Denis Lynch with the finals in Gothenburg just over a month away.
Also on the agenda at the three-day event in Westphalia is a CDI3* dressage competition, with a similarly stellar cast set to compete.
Hosts Germany, who boast the cream of world dressage riders, will be represented by Helen Langehanenberg on Damon Hill, as well as Kristina Sprehe, Dorothée Schneider and Isabelle Werth.
Also on the start list will be eventing champion Ingrid Klimke, who will prepare for her season with a dressage outing.
The competition in Dortmund runs from March 7 to 10 and the finals in Sweden from April 24 to 28.