diff --git a/property_packages/modular/modular_extended.py b/property_packages/modular/modular_extended.py
index c3c5b4d..cbaab3e 100644
--- a/property_packages/modular/modular_extended.py
+++ b/property_packages/modular/modular_extended.py
@@ -2,6 +2,7 @@
 from pyomo.core.base.expression import ScalarExpression
 from pyomo.core.base.var import ScalarVar, _GeneralVarData, VarData
 from idaes.core import declare_process_block_class
+from idaes.core.util.exceptions import ConfigurationError
 from idaes.models.properties.modular_properties.base.generic_property import (
     _GenericStateBlock,
     GenericParameterData,
@@ -136,7 +137,9 @@ def constrain(self, name: str, value: float):
         # Value must be a float. TODO: Handle unit conversion.
         var = getattr(self, name)
         if type(var) == ScalarExpression:
-            self.constraints.add_component(name, Constraint(expr=var == value))
+            c = Constraint(expr=var == value)
+            c.abcdef = True
+            self.constraints.add_component(name, c)
         elif type(var) in (ScalarVar, _GeneralVarData, VarData):
             var.fix(value)
         else:
diff --git a/test.py b/test.py
index 817a300..4e37047 100644
--- a/test.py
+++ b/test.py
@@ -16,7 +16,7 @@
 def report_vars(blk, file):
     with open(file, "w") as f:
         for c in blk.component_data_objects(Var, descend_into=True, active=True):
-            f.write(f"{c}: {c.value} {"fixed" if c.fixed else "unfixed"}\n")
+            f.write(f"{c}: {c.value} {'fixed' if c.fixed else 'unfixed'}\n")
     # with open("file8.txt", "r") as f:
     #     with open(f"{file}_diff", "w") as f2:
     #         for c in blk.component_data_objects(Var, descend_into=True):