diff --git a/lib/import/otrs/dynamic_field/checkbox.rb b/lib/import/otrs/dynamic_field/checkbox.rb
index 8666986ac..33044c8c6 100644
--- a/lib/import/otrs/dynamic_field/checkbox.rb
+++ b/lib/import/otrs/dynamic_field/checkbox.rb
@@ -11,7 +11,7 @@ module Import
                 true  => 'Yes',
                 false => 'No',
               },
-              null:      false,
+              null:      true,
               translate: true,
             }
           )
diff --git a/lib/import/otrs/dynamic_field/date.rb b/lib/import/otrs/dynamic_field/date.rb
index 6be4508bd..7d8d71133 100644
--- a/lib/import/otrs/dynamic_field/date.rb
+++ b/lib/import/otrs/dynamic_field/date.rb
@@ -14,7 +14,7 @@ module Import
               future: dynamic_field['Config']['YearsInFuture'] != '0',
               past:   dynamic_field['Config']['YearsInPast'] != '0',
               diff:   dynamic_field['Config']['DefaultValue'].to_i / 60 / 60 / 24,
-              null:   false,
+              null:   true,
             }
           )
         end
diff --git a/lib/import/otrs/dynamic_field/date_time.rb b/lib/import/otrs/dynamic_field/date_time.rb
index 997a4ac49..d9a7761b1 100644
--- a/lib/import/otrs/dynamic_field/date_time.rb
+++ b/lib/import/otrs/dynamic_field/date_time.rb
@@ -14,7 +14,7 @@ module Import
               future: dynamic_field['Config']['YearsInFuture'] != '0',
               past:   dynamic_field['Config']['YearsInPast'] != '0',
               diff:   dynamic_field['Config']['DefaultValue'].to_i / 60 / 60,
-              null:   false,
+              null:   true,
             }
           )
         end
diff --git a/lib/import/otrs/dynamic_field/dropdown.rb b/lib/import/otrs/dynamic_field/dropdown.rb
index a6d0d8c5a..6af21498b 100644
--- a/lib/import/otrs/dynamic_field/dropdown.rb
+++ b/lib/import/otrs/dynamic_field/dropdown.rb
@@ -6,11 +6,12 @@ module Import
           @attribute_config.merge!(
             data_type:   'select',
             data_option: {
-              default:   '',
-              multiple:  false,
-              options:   dynamic_field['Config']['PossibleValues'],
-              null:      dynamic_field['Config']['PossibleNone'] == '1',
-              translate: dynamic_field['Config']['TranslatableValues'] == '1',
+              default:    '',
+              multiple:   false,
+              options:    dynamic_field['Config']['PossibleValues'],
+              nulloption: dynamic_field['Config']['PossibleNone'] == '1',
+              null:       true,
+              translate:  dynamic_field['Config']['TranslatableValues'] == '1',
             }
           )
         end
diff --git a/lib/import/otrs/dynamic_field/multiselect.rb b/lib/import/otrs/dynamic_field/multiselect.rb
index 3710fc7d0..f1c13ef06 100644
--- a/lib/import/otrs/dynamic_field/multiselect.rb
+++ b/lib/import/otrs/dynamic_field/multiselect.rb
@@ -6,11 +6,12 @@ module Import
           @attribute_config.merge!(
             data_type:   'select',
             data_option: {
-              default:   '',
-              multiple:  true,
-              options:   dynamic_field['Config']['PossibleValues'],
-              null:      dynamic_field['Config']['PossibleNone'] == '1',
-              translate: dynamic_field['Config']['TranslatableValues'] == '1',
+              default:    '',
+              multiple:   true,
+              options:    dynamic_field['Config']['PossibleValues'],
+              nulloption: dynamic_field['Config']['PossibleNone'] == '1',
+              null:       true,
+              translate:  dynamic_field['Config']['TranslatableValues'] == '1',
             }
           )
         end
diff --git a/lib/import/otrs/dynamic_field/text.rb b/lib/import/otrs/dynamic_field/text.rb
index cafcb7f41..a5067ba02 100644
--- a/lib/import/otrs/dynamic_field/text.rb
+++ b/lib/import/otrs/dynamic_field/text.rb
@@ -9,7 +9,7 @@ module Import
               default:   dynamic_field['Config']['DefaultValue'],
               type:      'text',
               maxlength: 255,
-              null:      false,
+              null:      true,
             }
           )
         end
diff --git a/lib/import/otrs/dynamic_field/text_area.rb b/lib/import/otrs/dynamic_field/text_area.rb
index e4b71ce72..b25d54ce2 100644
--- a/lib/import/otrs/dynamic_field/text_area.rb
+++ b/lib/import/otrs/dynamic_field/text_area.rb
@@ -8,7 +8,7 @@ module Import
             data_option: {
               default: dynamic_field['Config']['DefaultValue'],
               rows:    dynamic_field['Config']['Rows'],
-              null:    false,
+              null:    true,
             }
           )
         end
diff --git a/spec/lib/import/otrs/dynamic_field/checkbox_spec.rb b/spec/lib/import/otrs/dynamic_field/checkbox_spec.rb
index 658467d92..000ecc5a1 100644
--- a/spec/lib/import/otrs/dynamic_field/checkbox_spec.rb
+++ b/spec/lib/import/otrs/dynamic_field/checkbox_spec.rb
@@ -29,7 +29,7 @@ RSpec.describe Import::OTRS::DynamicField::Checkbox do
           true => 'Yes',
           false => 'No'
         },
-        null: false,
+        null: true,
         translate: true
       }
     }
diff --git a/spec/lib/import/otrs/dynamic_field/date_spec.rb b/spec/lib/import/otrs/dynamic_field/date_spec.rb
index 2fa688a37..0de5e4cb4 100644
--- a/spec/lib/import/otrs/dynamic_field/date_spec.rb
+++ b/spec/lib/import/otrs/dynamic_field/date_spec.rb
@@ -33,7 +33,7 @@ RSpec.describe Import::OTRS::DynamicField::Date do
         future: false,
         past:   false,
         diff:   0,
-        null:   false
+        null:   true
       }
     }
 
diff --git a/spec/lib/import/otrs/dynamic_field/date_time_spec.rb b/spec/lib/import/otrs/dynamic_field/date_time_spec.rb
index 1fc1c7601..b2ac81093 100644
--- a/spec/lib/import/otrs/dynamic_field/date_time_spec.rb
+++ b/spec/lib/import/otrs/dynamic_field/date_time_spec.rb
@@ -33,7 +33,7 @@ RSpec.describe Import::OTRS::DynamicField::DateTime do
         future: true,
         past: true,
         diff: 72,
-        null: false
+        null: true
       }
     }
 
diff --git a/spec/lib/import/otrs/dynamic_field/dropdown_spec.rb b/spec/lib/import/otrs/dynamic_field/dropdown_spec.rb
index 75b7bce81..5cc0f1365 100644
--- a/spec/lib/import/otrs/dynamic_field/dropdown_spec.rb
+++ b/spec/lib/import/otrs/dynamic_field/dropdown_spec.rb
@@ -32,8 +32,9 @@ RSpec.describe Import::OTRS::DynamicField::Dropdown do
           'Köln'    => 'Köln',
           'Berlin'  => 'Berlin'
         },
-        null:      true,
-        translate: false
+        nulloption: true,
+        null:       true,
+        translate:  false
       }
     }
 
diff --git a/spec/lib/import/otrs/dynamic_field/multiselect_spec.rb b/spec/lib/import/otrs/dynamic_field/multiselect_spec.rb
index 4b7e0e1c8..be8ca129b 100644
--- a/spec/lib/import/otrs/dynamic_field/multiselect_spec.rb
+++ b/spec/lib/import/otrs/dynamic_field/multiselect_spec.rb
@@ -32,8 +32,9 @@ RSpec.describe Import::OTRS::DynamicField::Multiselect do
           'Köln'    => 'Köln',
           'Berlin'  => 'Berlin'
         },
-        null:      false,
-        translate: false
+        nulloption: false,
+        null:       true,
+        translate:  false
       }
     }
 
diff --git a/spec/lib/import/otrs/dynamic_field/text_area_spec.rb b/spec/lib/import/otrs/dynamic_field/text_area_spec.rb
index fa8e430af..18199a7ca 100644
--- a/spec/lib/import/otrs/dynamic_field/text_area_spec.rb
+++ b/spec/lib/import/otrs/dynamic_field/text_area_spec.rb
@@ -26,7 +26,7 @@ RSpec.describe Import::OTRS::DynamicField::TextArea do
       data_option:   {
         default: '',
         rows:    '20',
-        null:    false
+        null:    true
       }
     }
 
diff --git a/spec/lib/import/otrs/dynamic_field/text_spec.rb b/spec/lib/import/otrs/dynamic_field/text_spec.rb
index 34201654b..1b0919958 100644
--- a/spec/lib/import/otrs/dynamic_field/text_spec.rb
+++ b/spec/lib/import/otrs/dynamic_field/text_spec.rb
@@ -27,7 +27,7 @@ RSpec.describe Import::OTRS::DynamicField::Text do
         default:   '',
         type:      'text',
         maxlength: 255,
-        null:      false
+        null:      true
       }
     }