Index: Ringtoets/Integration/src/Ringtoets.Integration.Plugin/RingtoetsPlugin.cs
===================================================================
diff -u -rf8c28b3b04cdabb62ea37772efcb1f4ebbbf2b9e -r76e7f2d96ecaa823b6ef4f63bd5faef63886a0d5
--- Ringtoets/Integration/src/Ringtoets.Integration.Plugin/RingtoetsPlugin.cs	(.../RingtoetsPlugin.cs)	(revision f8c28b3b04cdabb62ea37772efcb1f4ebbbf2b9e)
+++ Ringtoets/Integration/src/Ringtoets.Integration.Plugin/RingtoetsPlugin.cs	(.../RingtoetsPlugin.cs)	(revision 76e7f2d96ecaa823b6ef4f63bd5faef63886a0d5)
@@ -836,8 +836,8 @@
             IEnumerable<AssessmentSection> sectionsWithDatabase = ringtoetsProject.AssessmentSections.Where(i => i.HydraulicBoundaryDatabase != null);
             foreach (AssessmentSection section in sectionsWithDatabase)
             {
-                string selectedFile = section.HydraulicBoundaryDatabase.FilePath;
-                string validationProblem = HydraulicBoundaryDatabaseHelper.ValidatePathForCalculation(selectedFile);
+                string validationProblem = HydraulicBoundaryDatabaseHelper.ValidatePathForCalculation(section.HydraulicBoundaryDatabase.FilePath,
+                                                                                                      section.HydraulicBoundaryDatabase.EffectivePreprocessorDirectory());
                 if (validationProblem != null)
                 {
                     log.WarnFormat(