diff --git a/src/routes.rs b/src/routes.rs
index 2e5d120..a6c653b 100644
--- a/src/routes.rs
+++ b/src/routes.rs
@@ -324,12 +324,18 @@ pub async fn get_object(
     })))
 }
 
+#[derive(Debug, Clone, Deserialize)]
+pub struct InEntry {
+    pub entity: Option<Address>,
+    pub attribute: String,
+    pub value: EntryValue,
+}
+
 #[derive(Debug, Clone, Deserialize)]
 #[serde(untagged)]
-pub enum InEntry {
-    Entry(Entry),
+pub enum PutInput {
+    Entry(InEntry),
     EntryList(Vec<Entry>),
-    Invariant(InvariantEntry),
     Address { entity: InAddress },
 }
 
@@ -367,7 +373,7 @@ impl TryInto<Address> for InAddress {
 pub async fn put_object(
     req: HttpRequest,
     state: web::Data<State>,
-    payload: Either<web::Json<InEntry>, Multipart>,
+    payload: Either<web::Json<PutInput>, Multipart>,
 ) -> Result<HttpResponse, Error> {
     check_auth(&req, &state)?;
 
@@ -379,15 +385,40 @@ pub async fn put_object(
             debug!("PUTting {in_entry:?}");
 
             match in_entry {
-                InEntry::Entry(entry) => Ok(web::block::<_, _, anyhow::Error>(move || {
-                    Ok((
-                        Some(connection.insert_entry(entry.clone())?),
-                        Some(entry.entity),
-                    ))
-                })
-                .await
-                .map_err(ErrorInternalServerError)?),
-                InEntry::EntryList(entries) => {
+                PutInput::Entry(in_entry) => {
+                    if let Some(entity) = in_entry.entity {
+                        let entry = Entry {
+                            entity,
+                            attribute: in_entry.attribute,
+                            value: in_entry.value,
+                        };
+
+                        Ok(web::block::<_, _, anyhow::Error>(move || {
+                            Ok((
+                                Some(connection.insert_entry(entry.clone())?),
+                                Some(entry.entity),
+                            ))
+                        })
+                        .await
+                        .map_err(ErrorInternalServerError)?)
+                    } else {
+                        let invariant = Entry::try_from(&InvariantEntry {
+                            attribute: in_entry.attribute,
+                            value: in_entry.value,
+                        })
+                        .map_err(ErrorInternalServerError)?;
+
+                        Ok(web::block::<_, _, anyhow::Error>(move || {
+                            Ok((
+                                Some(connection.insert_entry(invariant.clone())?),
+                                Some(invariant.entity),
+                            ))
+                        })
+                        .await
+                        .map_err(ErrorInternalServerError)?)
+                    }
+                }
+                PutInput::EntryList(entries) => {
                     web::block(move || {
                         connection.transaction::<_, anyhow::Error, _>(|| {
                             for entry in entries {
@@ -400,23 +431,7 @@ pub async fn put_object(
                     .map_err(ErrorInternalServerError)?;
                     Ok((None, None))
                 }
-                InEntry::Invariant(in_entry) => {
-                    let invariant = Entry::try_from(&InvariantEntry {
-                        attribute: in_entry.attribute,
-                        value: in_entry.value,
-                    })
-                    .map_err(ErrorInternalServerError)?;
-
-                    Ok(web::block::<_, _, anyhow::Error>(move || {
-                        Ok((
-                            Some(connection.insert_entry(invariant.clone())?),
-                            Some(invariant.entity),
-                        ))
-                    })
-                    .await
-                    .map_err(ErrorInternalServerError)?)
-                }
-                InEntry::Address { entity: in_address } => {
+                PutInput::Address { entity: in_address } => {
                     let address = in_address.try_into().map_err(ErrorBadRequest)?;
 
                     let label_entry = match &address {