From 96cd90069158cd3a24469916de610a214822af64 Mon Sep 17 00:00:00 2001
From: Uwe <donovaly@users.noreply.github.com>
Date: Wed, 10 Aug 2022 13:32:32 +0200
Subject: [PATCH] [FEM] electric Potential: add missing conversion

- add missing conversion of property change that was already done before FC 0.20
---
 src/Mod/Fem/femsolver/elmer/writer.py | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/src/Mod/Fem/femsolver/elmer/writer.py b/src/Mod/Fem/femsolver/elmer/writer.py
index 55a5597414..7ad4900181 100644
--- a/src/Mod/Fem/femsolver/elmer/writer.py
+++ b/src/Mod/Fem/femsolver/elmer/writer.py
@@ -648,6 +648,18 @@ class Writer(object):
                 for name in obj.References[0][1]:
                     if obj.PotentialEnabled:
                         if hasattr(obj, "Potential"):
+                            # Potential was once a float and scaled not fitting SI units
+                            if isinstance(obj.Potential, float):
+                                savePotential = obj.Potential
+                                obj.removeProperty("Potential")
+                                obj.addProperty(
+                                    "App::PropertyElectricPotential",
+                                    "Potential",
+                                    "Parameter",
+                                    "Electric Potential"
+                                    ),
+                                # scale to match SI units
+                                obj.Potential = savePotential * 1e6
                             potential = float(obj.Potential.getValueAs("V"))
                             self._boundary(name, "Potential", potential)
                     if obj.PotentialConstant: