diff --git a/model/horizontal.py b/model/horizontal.py
index ae229df5..90f7fed0 100644
--- a/model/horizontal.py
+++ b/model/horizontal.py
@@ -37,6 +37,8 @@ def needs_wp(self):
 
     def create_slvs_data(self, solvesys):
         wp = self.get_workplane()
+        if self.entity2:
+            return solvesys.horizontal(self.entity1.py_data, wp, self.entity2.py_data)
         return solvesys.horizontal(self.entity1.py_data, wp)
 
     def placements(self):
diff --git a/model/vertical.py b/model/vertical.py
index 2cf76515..51e41a2d 100644
--- a/model/vertical.py
+++ b/model/vertical.py
@@ -36,6 +36,8 @@ def needs_wp(self):
 
     def create_slvs_data(self, solvesys):
         wp = self.get_workplane()
+        if self.entity2:
+            return solvesys.vertical(self.entity1.py_data, wp, self.entity2.py_data)
         return solvesys.vertical(self.entity1.py_data, wp)
 
     def placements(self):