--- /dev/null
+## Copyright (C) 2018-20xx CEA/DEN, EDF R&D
+##
+## This library is free software; you can redistribute it and/or
+## modify it under the terms of the GNU Lesser General Public
+## License as published by the Free Software Foundation; either
+## version 2.1 of the License, or (at your option) any later version.
+##
+## This library is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+## Lesser General Public License for more details.
+##
+## You should have received a copy of the GNU Lesser General Public
+## License along with this library; if not, write to the Free Software
+## Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+##
+## See http:##www.salome-platform.org/ or
+## email : webmaster.salome@opencascade.com<mailto:webmaster.salome@opencascade.com>
+##
+
+"""
+ Test1963.py
+ Test case for issue #1963 "Conflicting constraint wrongly raised"
+"""
+
+from salome.shaper import model
+
+model.begin()
+partSet = model.moduleDocument()
+Part_1 = model.addPart(partSet)
+Part_1_doc = Part_1.document()
+Sketch_1 = model.addSketch(Part_1_doc, model.defaultPlane("XOZ"))
+SketchLine_1 = Sketch_1.addLine(6.188, 9.263, 6.188, -3.45)
+SketchLine_2 = Sketch_1.addLine(6.188, -3.45, 0, -3.45)
+SketchConstraintCoincidence_1 = Sketch_1.setCoincident(SketchLine_1.endPoint(), SketchLine_2.startPoint())
+SketchLine_3 = Sketch_1.addLine(0, -3.45, 0, -6.45)
+SketchConstraintCoincidence_2 = Sketch_1.setCoincident(SketchLine_2.endPoint(), SketchLine_3.startPoint())
+SketchLine_4 = Sketch_1.addLine(0, -6.45, 10.31630157312683, -6.45)
+SketchConstraintCoincidence_3 = Sketch_1.setCoincident(SketchLine_3.endPoint(), SketchLine_4.startPoint())
+SketchLine_5 = Sketch_1.addLine(10.31630157312683, -6.45, 10.31630157312683, -3.45)
+SketchConstraintCoincidence_4 = Sketch_1.setCoincident(SketchLine_4.endPoint(), SketchLine_5.startPoint())
+SketchLine_6 = Sketch_1.addLine(10.31630157312683, -3.45, 6.538, -3.45)
+SketchConstraintCoincidence_5 = Sketch_1.setCoincident(SketchLine_5.endPoint(), SketchLine_6.startPoint())
+SketchConstraintVertical_1 = Sketch_1.setVertical(SketchLine_1.result())
+SketchConstraintHorizontal_1 = Sketch_1.setHorizontal(SketchLine_2.result())
+SketchConstraintHorizontal_2 = Sketch_1.setHorizontal(SketchLine_6.result())
+SketchConstraintHorizontal_3 = Sketch_1.setHorizontal(SketchLine_4.result())
+SketchConstraintVertical_2 = Sketch_1.setVertical(SketchLine_5.result())
+SketchConstraintVertical_3 = Sketch_1.setVertical(SketchLine_3.result())
+SketchConstraintCoincidence_6 = Sketch_1.setCoincident(SketchLine_6.endPoint(), SketchLine_2.result())
+SketchLine_7 = Sketch_1.addLine(model.selection("EDGE", "PartSet/OZ"))
+SketchLine_7.setName("SketchLine_8")
+SketchLine_7.result().setName("SketchLine_8")
+SketchConstraintCoincidence_7 = Sketch_1.setCoincident(SketchLine_3.startPoint(), SketchLine_7.result())
+SketchLine_8 = Sketch_1.addLine(6.188, 9.263, 6.376, 9.263)
+SketchLine_8.setName("SketchLine_9")
+SketchLine_8.result().setName("SketchLine_9")
+SketchLine_8.setAuxiliary(True)
+SketchConstraintCoincidence_8 = Sketch_1.setCoincident(SketchLine_1.startPoint(), SketchLine_8.startPoint())
+SketchConstraintHorizontal_4 = Sketch_1.setHorizontal(SketchLine_8.result())
+SketchConstraintDistance_1 = Sketch_1.setDistance(SketchLine_7.startPoint(), SketchLine_1.result(), 6.188)
+SketchLine_9 = Sketch_1.addLine(6.376, 9.263, 6.376, -2.284019283906062)
+SketchLine_9.setName("SketchLine_10")
+SketchLine_9.result().setName("SketchLine_10")
+SketchConstraintCoincidence_9 = Sketch_1.setCoincident(SketchLine_8.endPoint(), SketchLine_9.startPoint())
+SketchLine_10 = Sketch_1.addLine(6.376, -2.284019283906062, 6.538, -2.359739840005481)
+SketchLine_10.setName("SketchLine_11")
+SketchLine_10.result().setName("SketchLine_11")
+SketchConstraintCoincidence_10 = Sketch_1.setCoincident(SketchLine_9.endPoint(), SketchLine_10.startPoint())
+SketchLine_11 = Sketch_1.addLine(6.538, -2.359739840005481, 6.538, -3.45)
+SketchLine_11.setName("SketchLine_12")
+SketchLine_11.result().setName("SketchLine_12")
+SketchConstraintCoincidence_11 = Sketch_1.setCoincident(SketchLine_10.endPoint(), SketchLine_11.startPoint())
+SketchConstraintCoincidence_12 = Sketch_1.setCoincident(SketchLine_6.endPoint(), SketchLine_11.endPoint())
+SketchConstraintVertical_4 = Sketch_1.setVertical(SketchLine_9.result())
+SketchConstraintVertical_5 = Sketch_1.setVertical(SketchLine_11.result())
+SketchConstraintDistance_2 = Sketch_1.setDistance(SketchLine_1.startPoint(), SketchLine_9.result(), 0.188)
+SketchConstraintDistance_3 = Sketch_1.setDistance(SketchLine_1.result(), SketchLine_11.endPoint(), 0.35)
+SketchConstraintLength_1 = Sketch_1.setLength(SketchLine_3.result(), 3)
+SketchConstraintDistance_4 = Sketch_1.setDistance(SketchLine_7.startPoint(), SketchLine_2.result(), 3.45)
+SketchLine_12 = Sketch_1.addLine(model.selection("EDGE", "PartSet/OX"))
+SketchLine_12.setName("SketchLine_13")
+SketchLine_12.result().setName("SketchLine_13")
+SketchConstraintDistance_5 = Sketch_1.setDistance(SketchLine_1.startPoint(), SketchLine_12.result(), 9.263)
+SketchLine_13 = Sketch_1.addLine(7.131011037651645, -4.08833050970321, 5.469691015801997, -4.08833050970321)
+SketchLine_13.setName("SketchLine_14")
+SketchLine_13.result().setName("SketchLine_14")
+SketchLine_14 = Sketch_1.addLine(5.469691015801997, -4.08833050970321, 5.469691015801997, -5.799435189085778)
+SketchLine_14.setName("SketchLine_15")
+SketchLine_14.result().setName("SketchLine_15")
+SketchLine_15 = Sketch_1.addLine(5.469691015801997, -5.799435189085778, 7.131011037651645, -5.799435189085778)
+SketchLine_15.setName("SketchLine_16")
+SketchLine_15.result().setName("SketchLine_16")
+SketchLine_16 = Sketch_1.addLine(7.131011037651645, -5.799435189085778, 7.131011037651645, -4.08833050970321)
+SketchLine_16.setName("SketchLine_17")
+SketchLine_16.result().setName("SketchLine_17")
+SketchConstraintCoincidence_13 = Sketch_1.setCoincident(SketchLine_16.endPoint(), SketchLine_13.startPoint())
+SketchConstraintCoincidence_14 = Sketch_1.setCoincident(SketchLine_13.endPoint(), SketchLine_14.startPoint())
+SketchConstraintCoincidence_15 = Sketch_1.setCoincident(SketchLine_14.endPoint(), SketchLine_15.startPoint())
+SketchConstraintCoincidence_16 = Sketch_1.setCoincident(SketchLine_15.endPoint(), SketchLine_16.startPoint())
+SketchConstraintHorizontal_5 = Sketch_1.setHorizontal(SketchLine_13.result())
+SketchConstraintVertical_6 = Sketch_1.setVertical(SketchLine_14.result())
+SketchConstraintHorizontal_6 = Sketch_1.setHorizontal(SketchLine_15.result())
+SketchConstraintVertical_7 = Sketch_1.setVertical(SketchLine_16.result())
+SketchLine_17 = Sketch_1.addLine(6.282, 9.263, 6.282, -4.088330509703209)
+SketchLine_17.setName("SketchLine_18")
+SketchLine_17.result().setName("SketchLine_18")
+SketchLine_17.setAuxiliary(True)
+SketchConstraintCoincidence_17 = Sketch_1.setCoincident(SketchLine_17.startPoint(), SketchLine_8.result())
+SketchConstraintCoincidence_18 = Sketch_1.setCoincident(SketchLine_17.endPoint(), SketchLine_13.result())
+SketchConstraintVertical_8 = Sketch_1.setVertical(SketchLine_17.result())
+SketchConstraintMiddle_1 = Sketch_1.setMiddlePoint(SketchLine_17.startPoint(), SketchLine_8.result())
+model.do()
+
+# check sketch is correct
+assert(Sketch_1.solverError().value() == "")
+
+SketchConstraintMiddle_2 = Sketch_1.setMiddlePoint(SketchLine_17.endPoint(), SketchLine_13.result())
+SketchConstraintDistance_6 = Sketch_1.setDistance(SketchLine_17.endPoint(), SketchLine_5.result(), 1.5, True)
+model.do()
+
+# check sketch is still correct
+assert(Sketch_1.solverError().value() == "")
+
+model.end()
