diff --git a/pkg/api/form.go b/pkg/api/form.go
index 11a6a275..df5b2868 100644
--- a/pkg/api/form.go
+++ b/pkg/api/form.go
@@ -31,6 +31,7 @@ import (
 	"github.com/pdfcpu/pdfcpu/pkg/pdfcpu/create"
 	"github.com/pdfcpu/pdfcpu/pkg/pdfcpu/form"
 	"github.com/pdfcpu/pdfcpu/pkg/pdfcpu/model"
+	"github.com/pdfcpu/pdfcpu/pkg/pdfcpu/types"
 	"github.com/pkg/errors"
 )
 
@@ -479,6 +480,66 @@ func ExportFormFile(inFilePDF, outFileJSON string, conf *model.Configuration) (e
 	return ExportFormJSON(f1, f2, inFilePDF, conf)
 }
 
+func validateComboBoxValues(f form.Form) error {
+	for _, cb := range f.ComboBoxes {
+		if cb.Value == "" || cb.Editable {
+			continue
+		}
+		if len(cb.Options) > 0 {
+			if !types.MemberOf(cb.Value, cb.Options) {
+				return errors.Errorf("pdfcpu: fill field name: \"%s\" unknown value: \"%s\" - options: %v\n", cb.Name, cb.Value, cb.Options)
+			}
+		}
+	}
+	return nil
+}
+
+func validateListBoxValues(f form.Form) error {
+	for _, lb := range f.ListBoxes {
+		if len(lb.Values) == 0 {
+			continue
+		}
+		if len(lb.Options) > 0 {
+			for _, v := range lb.Values {
+				if !types.MemberOf(v, lb.Options) {
+					return errors.Errorf("pdfcpu: fill field name: \"%s\" unknown value: \"%s\" - options: %v\n", lb.Name, v, lb.Options)
+				}
+			}
+		}
+	}
+	return nil
+}
+
+func validateRadioButtonGroupValues(f form.Form) error {
+	for _, rbg := range f.RadioButtonGroups {
+		if rbg.Value == "" {
+			continue
+		}
+		if len(rbg.Options) > 0 {
+			if !types.MemberOf(rbg.Value, rbg.Options) {
+				return errors.Errorf("pdfcpu: fill field name: \"%s\" unknown value: \"%s\" - options: %v\n", rbg.Name, rbg.Value, rbg.Options)
+			}
+		}
+	}
+	return nil
+}
+
+func validateOptionValues(f form.Form) error {
+	if err := validateRadioButtonGroupValues(f); err != nil {
+		return err
+	}
+
+	if err := validateComboBoxValues(f); err != nil {
+		return err
+	}
+
+	if err := validateListBoxValues(f); err != nil {
+		return err
+	}
+
+	return nil
+}
+
 // FillForm populates the form rs with data from rd and writes the result to w.
 func FillForm(rs io.ReadSeeker, rd io.Reader, w io.Writer, conf *model.Configuration) error {
 	if rs == nil {
@@ -528,6 +589,14 @@ func FillForm(rs io.ReadSeeker, rd io.Reader, w io.Writer, conf *model.Configura
 
 	f := formGroup.Forms[0]
 
+	if err := validateOptionValues(f); err != nil {
+		return err
+	}
+
+	if log.CLIEnabled() {
+		log.CLI.Println("filling...")
+	}
+
 	ok, pp, err := form.FillForm(ctx, form.FillDetails(&f, nil), f.Pages, form.JSON)
 	if err != nil {
 		return err
diff --git a/pkg/pdfcpu/form/fill.go b/pkg/pdfcpu/form/fill.go
index b92adaad..8915a3f7 100644
--- a/pkg/pdfcpu/form/fill.go
+++ b/pkg/pdfcpu/form/fill.go
@@ -610,7 +610,7 @@ func fillBtn(
 		return nil
 	}
 
-	if len(d.ArrayEntry("Kids")) > 0 && primitives.FieldFlags(*ff)&primitives.FieldRadio > 0 {
+	if len(d.ArrayEntry("Kids")) > 0 {
 		if err := fillRadioButtonGroup(ctx, d, id, name, locked, format, fillDetails, ok); err != nil {
 			return err
 		}
diff --git a/pkg/pdfcpu/form/form.go b/pkg/pdfcpu/form/form.go
index 3c7e7eac..0efa08c5 100644
--- a/pkg/pdfcpu/form/form.go
+++ b/pkg/pdfcpu/form/form.go
@@ -360,9 +360,7 @@ func collectBtn(xRefTable *model.XRefTable, d types.Dict, f *Field, fm *FieldMet
 	}
 
 	if len(d.ArrayEntry("Kids")) > 0 {
-		if ff != nil && primitives.FieldFlags(*ff)&primitives.FieldRadio > 0 {
-			return collectRadioButtonGroup(xRefTable, d, f, fm)
-		}
+		return collectRadioButtonGroup(xRefTable, d, f, fm)
 	}
 
 	f.Typ = FTCheckBox
diff --git a/pkg/pdfcpu/model/xreftable.go b/pkg/pdfcpu/model/xreftable.go
index 08f44f86..ffd96767 100644
--- a/pkg/pdfcpu/model/xreftable.go
+++ b/pkg/pdfcpu/model/xreftable.go
@@ -2810,7 +2810,7 @@ func (xRefTable *XRefTable) RectForArray(a types.Array) (*types.Rectangle, error
 		return nil, err
 	}
 
-	ury, err := xRefTable.DereferenceNumber(a[2])
+	ury, err := xRefTable.DereferenceNumber(a[3])
 	if err != nil {
 		return nil, err
 	}