diff --git a/CHANGES.rst b/CHANGES.rst
index 4fed2fc37c..7dd3226a02 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -25,6 +25,7 @@ Changelog
 
 **Fixed**
 
+- #385 Integration of PR-2309 Folderitems methods of Instrument Calibrations, Certifications and Validations are missing some objects
 - #384 Integration of PR-2306. Do not use localized date for chart js
 - #382 Integration of PR-2305. Bika Listing for Analysis Specifications fails on category expansion
 - #380 Integration of PR-2302. UnicodeDecodeError if title field validator
diff --git a/bika/lims/browser/instrument.py b/bika/lims/browser/instrument.py
index 8598eeb30f..08b537659c 100644
--- a/bika/lims/browser/instrument.py
+++ b/bika/lims/browser/instrument.py
@@ -90,6 +90,9 @@ def __init__(self, context, request):
                          'getMaintainer']},
         ]
 
+    def contentsMethod(self, *args, **kw):
+        return self.context.getMaintenanceTasks()
+
     def folderitems(self):
         items = BikaListingView.folderitems(self)
         outitems = []
@@ -166,6 +169,9 @@ def __init__(self, context, request):
                          'getCalibrator']},
         ]
 
+    def contentsMethod(self, *args, **kw):
+        return self.context.getCalibrations()
+
     def folderitems(self):
         items = BikaListingView.folderitems(self)
         outitems = []
@@ -223,6 +229,9 @@ def __init__(self, context, request):
                          'getValidator']},
         ]
 
+    def contentsMethod(self, *args, **kw):
+        return self.context.getValidations()
+
     def folderitems(self):
         items = BikaListingView.folderitems(self)
         outitems = []
@@ -304,6 +313,9 @@ def __init__(self, context, request):
                          'created']},
         ]
 
+    def contentsMethod(self, *args, **kw):
+        return self.context.getSchedule()
+
     def folderitems(self):
         items = BikaListingView.folderitems(self)
         outitems = []