diff --git a/yopa-web/Cargo.toml b/yopa-web/Cargo.toml
index e7b3e23..f227731 100644
--- a/yopa-web/Cargo.toml
+++ b/yopa-web/Cargo.toml
@@ -8,7 +8,7 @@ build = "build.rs"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-yopa = { path = "../yopa" }
+yopa = { path = "../yopa", features = [] }
 serde = "1"
 serde_json = "1"
 
diff --git a/yopa-web/resources/templates/model_create.html.tera b/yopa-web/resources/templates/model_create.html.tera
index 75508d3..4b737f3 100644
--- a/yopa-web/resources/templates/model_create.html.tera
+++ b/yopa-web/resources/templates/model_create.html.tera
@@ -12,6 +12,8 @@ Define object
 
 <h1>Define new object model</h1>
 
+{# TODO implement value restoration on error #}
+
 <form action="/model/object/create" method="POST">
 	<label for="name">Name:</label>
 	<input type="text" id="name" name="name"><br>
diff --git a/yopa-web/resources/templates/property_create.html.tera b/yopa-web/resources/templates/property_create.html.tera
index 625f5db..1af482e 100644
--- a/yopa-web/resources/templates/property_create.html.tera
+++ b/yopa-web/resources/templates/property_create.html.tera
@@ -10,20 +10,23 @@ Define property
 
 {% block content -%}
 
-<h1>Add new property to model "{{model.name}}"</h1>
+{# The parent can be either object or relation model #}
+<h1>Add new property to {{object.describe}}</h1>
+
+{# TODO implement value restoration on error #}
 
 <form action="/model/property/create" method="POST">
-	<input type="hidden" name="object" value="{{object}}">
+	<input type="hidden" name="object" value="{{object.id}}">
 
 	<label for="name">Name:</label>
 	<input type="text" id="name" name="name"><br>
 
 	<label for="optional">Optional:</label>
-	<input type="checkbox" name="optional" id="optional">
+	<input type="checkbox" name="optional" id="optional" value="1">
 	<br>
 
 	<label for="multiple">Multiple:</label>
-	<input type="checkbox" name="multiple" id="multiple"><br>
+	<input type="checkbox" name="multiple" id="multiple" value="1"><br>
 
 	<label for="data_type">Type:</label>
 	<select name="data_type" id="data_type">
diff --git a/yopa-web/resources/templates/relation_create.html.tera b/yopa-web/resources/templates/relation_create.html.tera
index f1e2c90..b84ac8f 100644
--- a/yopa-web/resources/templates/relation_create.html.tera
+++ b/yopa-web/resources/templates/relation_create.html.tera
@@ -12,6 +12,8 @@ Define relation
 
 <h1>Define new relation from "{{object.name}}"</h1>
 
+{# TODO implement value restoration on error #}
+
 <form action="/model/relation/create" method="POST">
 	<input type="hidden" name="object" value="{{object.id}}">
 
diff --git a/yopa-web/src/main.rs b/yopa-web/src/main.rs
index 443e972..c892905 100644
--- a/yopa-web/src/main.rs
+++ b/yopa-web/src/main.rs
@@ -99,6 +99,8 @@ async fn main() -> std::io::Result<()> {
             .service(routes::object_model_create)
             .service(routes::relation_model_create_form)
             .service(routes::relation_model_create)
+            .service(routes::property_model_create_form)
+            .service(routes::property_model_create)
             .service(routes::object_model_delete)
             .service(routes::relation_model_delete)
             .service(routes::property_model_delete)
diff --git a/yopa-web/src/routes.rs b/yopa-web/src/routes.rs
index f5b54f6..a415229 100644
--- a/yopa-web/src/routes.rs
+++ b/yopa-web/src/routes.rs
@@ -1,7 +1,7 @@
 use actix_web::{web, HttpRequest, Responder, HttpResponse};
 use crate::TERA;
 use crate::tera_ext::TeraExt;
-use yopa::{Storage, StorageError, ID};
+use yopa::{Storage, StorageError, ID, DataType, TypedValue};
 use serde::{Deserialize, Serialize};
 use yopa::model::{PropertyModel, RelationModel, ObjectModel};
 use std::ops::DerefMut;
@@ -44,7 +44,10 @@ impl ParseOrBadReq for &str {
               E: Display + Debug + 'static
     {
         self.parse::<T>()
-            .map_err(|e| actix_web::error::ErrorBadRequest(e))
+            .map_err(|e| {
+                error!("Parse error for \"{}\"", self);
+                actix_web::error::ErrorBadRequest(e)
+            })
     }
 }
 
@@ -209,6 +212,147 @@ pub(crate) async fn relation_model_create(
     }
 }
 
+#[derive(Serialize, Debug)]
+struct ObjectOrRelationModelDisplay {
+    id : ID,
+    describe : String,
+}
+
+#[get("/model/property/create/{object_id}")]
+pub(crate) async fn property_model_create_form(
+    object_id : web::Path<String>,
+    store : crate::YopaStoreWrapper,
+    session : Session
+) -> actix_web::Result<impl Responder> {
+    let mut context = tera::Context::new();
+    session.render_flash(&mut context);
+
+    let rg = store.read().await;
+
+    debug!("ID = {}", object_id);
+
+    let object = {
+        let id = object_id.parse_or_bad_request()?;
+        debug!("Create property for ID={}", id);
+        if let Some(om) = rg.get_object_model(id) {
+            ObjectOrRelationModelDisplay {
+                id: om.id,
+                describe: format!("object model \"{}\"", om.name),
+            }
+        } else if let Some(rm) = rg.get_relation_model(id) {
+            ObjectOrRelationModelDisplay {
+                id: rm.id,
+                describe: format!("relation model \"{}\"", rm.name),
+            }
+        } else {
+            return Err(actix_web::error::ErrorNotFound("No such source object"));
+        }
+    };
+
+    context.insert("object", &object);
+    TERA.build_response("property_create", &context)
+}
+
+#[derive(Deserialize)]
+pub(crate) struct PropertyModelCreate {
+    pub object : ID,
+    pub name : String,
+    pub optional : Option<i32>,
+    pub multiple : Option<i32>,
+    pub data_type : DataType,
+    /// Default value to be parsed to the data type
+    /// May be unused if empty and optional
+    pub default : String,
+}
+
+#[post("/model/property/create")]
+pub(crate) async fn property_model_create(
+    form : web::Form<PropertyModelCreate>,
+    store : crate::YopaStoreWrapper,
+    session : Session
+) -> actix_web::Result<impl Responder> {
+    let mut wg = store.write().await;
+    let form = form.into_inner();
+
+    let optional = form.optional.unwrap_or_default() != 0;
+    let multiple = form.multiple.unwrap_or_default() != 0;
+
+    match wg.define_property(PropertyModel {
+        id: Default::default(),
+        object: form.object,
+        name: form.name.clone(),
+        optional,
+        multiple,
+        data_type: form.data_type,
+        default: {
+            match form.data_type {
+                DataType::String => {
+                    if form.default.is_empty() && optional {
+                        None
+                    } else {
+                        Some(TypedValue::String(form.default.into()))
+                    }
+                }
+                DataType::Integer => {
+                    if form.default.is_empty() {
+                        if optional {
+                            None
+                        } else {
+                            Some(TypedValue::Integer(0))
+                        }
+                    } else {
+                        // TODO better error reporting
+                        Some(TypedValue::Integer(form.default.parse()
+                            .map_err(|_| {
+                                actix_web::error::ErrorBadRequest(format!("Error parsing \"{}\" as integer", form.default))
+                            })?))
+                    }
+                }
+                DataType::Decimal => {
+                    if form.default.is_empty() {
+                        if optional {
+                            None
+                        } else {
+                            Some(TypedValue::Decimal(0.0))
+                        }
+                    } else {
+                        // TODO better error reporting
+                        Some(TypedValue::Decimal(form.default.parse()
+                            .map_err(|_| {
+                                actix_web::error::ErrorBadRequest(format!("Error parsing \"{}\" as decimal", form.default))
+                            })?))
+                    }
+                }
+                DataType::Boolean => {
+                    if form.default.is_empty() {
+                        if optional {
+                            None
+                        } else {
+                            Some(TypedValue::Boolean(false))
+                        }
+                    } else {
+                        Some(TypedValue::String(form.default.clone().into())
+                            .cast_to(DataType::Boolean).map_err(|_| {
+                                actix_web::error::ErrorBadRequest(format!("Error parsing \"{}\" as boolean", form.default))
+                            })?)
+                    }
+                }
+            }
+        }
+    }) {
+        Ok(_id) => {
+            debug!("Property created, redirecting to root");
+            session.flash_success(format!("Property model \"{}\" created.", form.name));
+            redirect("/")
+        }
+        Err(e) => {
+            warn!("Error creating property model: {:?}", e);
+            session.flash_error(e.to_string());
+            redirect(format!("/model/property/create/{}", form.object))
+        }
+    }
+}
+
 #[get("/model/object/delete/{id}")]
 pub(crate) async fn object_model_delete(
     id : web::Path<String>,
diff --git a/yopa/Cargo.toml b/yopa/Cargo.toml
index ca36030..b83f136 100644
--- a/yopa/Cargo.toml
+++ b/yopa/Cargo.toml
@@ -22,5 +22,5 @@ itertools = "0.10.0"
 lazy_static = "1.4.0"
 
 [features]
-default = ["uuid-ids"]
+default = []
 uuid-ids = ["uuid"]