Index: Ringtoets/Integration/src/Ringtoets.Integration.Plugin/RingtoetsPlugin.cs
===================================================================
diff -u -r6b8f6422c0a6f96f8e563bb6afb82a7a192142b4 -r9cf89e3f60d17b61c5ef1ba1c4c7e18ca0c9b2f4
--- Ringtoets/Integration/src/Ringtoets.Integration.Plugin/RingtoetsPlugin.cs	(.../RingtoetsPlugin.cs)	(revision 6b8f6422c0a6f96f8e563bb6afb82a7a192142b4)
+++ Ringtoets/Integration/src/Ringtoets.Integration.Plugin/RingtoetsPlugin.cs	(.../RingtoetsPlugin.cs)	(revision 9cf89e3f60d17b61c5ef1ba1c4c7e18ca0c9b2f4)
@@ -839,8 +839,8 @@
             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(