diff --git a/pdfbox-validation-model/src/main/java/org/verapdf/model/impl/pb/pd/PBoxPDFormField.java b/pdfbox-validation-model/src/main/java/org/verapdf/model/impl/pb/pd/PBoxPDFormField.java
index 82e66452..889e76ab 100644
--- a/pdfbox-validation-model/src/main/java/org/verapdf/model/impl/pb/pd/PBoxPDFormField.java
+++ b/pdfbox-validation-model/src/main/java/org/verapdf/model/impl/pb/pd/PBoxPDFormField.java
@@ -70,6 +70,11 @@ public String getTU() {
         return null;
     }
 
+    @Override
+    public Long getFf() {
+        return null;
+    }
+
     @Override
     public List<? extends Object> getLinkedObjects(String link) {
         switch (link) {
diff --git a/pdfbox-validation-model/src/main/java/org/verapdf/model/impl/pb/pd/pboxse/PBoxSEFENote.java b/pdfbox-validation-model/src/main/java/org/verapdf/model/impl/pb/pd/pboxse/PBoxSEFENote.java
index ffebf725..10c8fe88 100644
--- a/pdfbox-validation-model/src/main/java/org/verapdf/model/impl/pb/pd/pboxse/PBoxSEFENote.java
+++ b/pdfbox-validation-model/src/main/java/org/verapdf/model/impl/pb/pd/pboxse/PBoxSEFENote.java
@@ -32,4 +32,9 @@ public class PBoxSEFENote extends PBoxSEGeneral implements SEFENote {
     public PBoxSEFENote(COSDictionary structElemDictionary, TaggedPDFRoleMapHelper roleMapHelper) {
         super(structElemDictionary, roleMapHelper, TaggedPDFConstants.FENOTE, FENOTE_STRUCTURE_ELEMENT_TYPE);
     }
+
+    @Override
+    public String getNoteType() {
+        return null;
+    }
 }
diff --git a/pdfbox-validation-model/src/main/java/org/verapdf/model/impl/pb/pd/pboxse/PBoxSEFormula.java b/pdfbox-validation-model/src/main/java/org/verapdf/model/impl/pb/pd/pboxse/PBoxSEFormula.java
index 9f313bf9..9ab04f36 100644
--- a/pdfbox-validation-model/src/main/java/org/verapdf/model/impl/pb/pd/pboxse/PBoxSEFormula.java
+++ b/pdfbox-validation-model/src/main/java/org/verapdf/model/impl/pb/pd/pboxse/PBoxSEFormula.java
@@ -32,4 +32,9 @@ public class PBoxSEFormula extends PBoxSEGeneral implements SEFormula {
     public PBoxSEFormula(COSDictionary structElemDictionary, TaggedPDFRoleMapHelper roleMapHelper) {
         super(structElemDictionary, roleMapHelper, TaggedPDFConstants.FORMULA, FORMULA_STRUCTURE_ELEMENT_TYPE);
     }
+
+    @Override
+    public Boolean getisMathFormula() {
+        return null;
+    }
 }
diff --git a/pdfbox-validation-model/src/main/java/org/verapdf/model/impl/pb/pd/pboxse/PBoxSEL.java b/pdfbox-validation-model/src/main/java/org/verapdf/model/impl/pb/pd/pboxse/PBoxSEL.java
index 3d6e04ed..be2ada5a 100644
--- a/pdfbox-validation-model/src/main/java/org/verapdf/model/impl/pb/pd/pboxse/PBoxSEL.java
+++ b/pdfbox-validation-model/src/main/java/org/verapdf/model/impl/pb/pd/pboxse/PBoxSEL.java
@@ -32,4 +32,14 @@ public class PBoxSEL extends PBoxSEGeneral implements SEL {
     public PBoxSEL(COSDictionary structElemDictionary, TaggedPDFRoleMapHelper roleMapHelper) {
         super(structElemDictionary, roleMapHelper, TaggedPDFConstants.L, L_STRUCTURE_ELEMENT_TYPE);
     }
+
+    @Override
+    public String getListNumbering() {
+        return null;
+    }
+
+    @Override
+    public Boolean getcontainsLabels() {
+        return null;
+    }
 }
diff --git a/pdfbox-validation-model/src/main/java/org/verapdf/model/impl/pb/pd/pboxse/PBoxSETOCI.java b/pdfbox-validation-model/src/main/java/org/verapdf/model/impl/pb/pd/pboxse/PBoxSETOCI.java
index 49440e03..d71d8bdf 100644
--- a/pdfbox-validation-model/src/main/java/org/verapdf/model/impl/pb/pd/pboxse/PBoxSETOCI.java
+++ b/pdfbox-validation-model/src/main/java/org/verapdf/model/impl/pb/pd/pboxse/PBoxSETOCI.java
@@ -32,4 +32,9 @@ public class PBoxSETOCI extends PBoxSEGeneral implements SETOCI {
     public PBoxSETOCI(COSDictionary structElemDictionary, TaggedPDFRoleMapHelper roleMapHelper) {
         super(structElemDictionary, roleMapHelper, TaggedPDFConstants.TOCI, TOCI_STRUCTURE_ELEMENT_TYPE);
     }
+
+    @Override
+    public Boolean getcontainsRef() {
+        return null;
+    }
 }