diff --git a/common/proto/table_definition.proto b/common/proto/table_definition.proto
index a0d9d328..c73de16a 100644
--- a/common/proto/table_definition.proto
+++ b/common/proto/table_definition.proto
@@ -353,6 +353,9 @@ message ColumnBehavior {
 
   // Logical source column name, empty for ordinary user-defined columns.
   string generated_from = 3;
+
+  // True when clients may offer this column in an alias rename picker.
+  bool renameable = 4;
 }
 
 // A script that targets a specific column in a table.
diff --git a/common/src/proto/descriptor.bin b/common/src/proto/descriptor.bin
index 8a1045f9..358dde94 100644
Binary files a/common/src/proto/descriptor.bin and b/common/src/proto/descriptor.bin differ
diff --git a/common/src/proto/komp_ac.table_definition.rs b/common/src/proto/komp_ac.table_definition.rs
index d870c9c1..ffb8f478 100644
--- a/common/src/proto/komp_ac.table_definition.rs
+++ b/common/src/proto/komp_ac.table_definition.rs
@@ -363,6 +363,9 @@ pub struct ColumnBehavior {
     /// Logical source column name, empty for ordinary user-defined columns.
     #[prost(string, tag = "3")]
     pub generated_from: ::prost::alloc::string::String,
+    /// True when clients may offer this column in an alias rename picker.
+    #[prost(bool, tag = "4")]
+    pub renameable: bool,
 }
 /// A script that targets a specific column in a table.
 #[derive(Clone, PartialEq, Eq, Hash, ::prost::Message)]
diff --git a/server b/server
index 5b6b8603..da8681a1 160000
--- a/server
+++ b/server
@@ -1 +1 @@
-Subproject commit 5b6b860372459553eced168717d4dd4ecc639a26
+Subproject commit da8681a1c2df5c254ee9f6f1dc2c1f944e171185
diff --git a/web/src/pages/admin/table_definition/loader.rs b/web/src/pages/admin/table_definition/loader.rs
index 542cd8bc..61cacc26 100644
--- a/web/src/pages/admin/table_definition/loader.rs
+++ b/web/src/pages/admin/table_definition/loader.rs
@@ -177,6 +177,7 @@ pub(crate) async fn load_page(
                                 generated_from: behavior
                                     .map(|behavior| behavior.generated_from.clone())
                                     .unwrap_or_default(),
+                                renameable: behavior.is_some_and(|behavior| behavior.renameable),
                             }
                         })
                         .collect(),
diff --git a/web/src/pages/admin/table_definition/state.rs b/web/src/pages/admin/table_definition/state.rs
index 1145bce2..a61ee357 100644
--- a/web/src/pages/admin/table_definition/state.rs
+++ b/web/src/pages/admin/table_definition/state.rs
@@ -74,13 +74,13 @@ impl TableDetailView {
         self.table_kind == "system"
     }
 
-    /// Columns a rename may target. A generated companion (`phone_country`,
-    /// the accounting fields) belongs to the column it was derived from, and
-    /// the server refuses to rename one.
+    /// Columns a rename may target. Provenance and renameability are separate:
+    /// accounting companions remain renameable while protected generated
+    /// columns do not.
     pub(crate) fn renameable_columns(&self) -> Vec<&DetailColumn> {
         self.columns
             .iter()
-            .filter(|column| !column.generated)
+            .filter(|column| column.renameable)
             .collect()
     }
 }
@@ -98,6 +98,7 @@ pub(crate) struct DetailColumn {
     pub generated: bool,
     pub read_only: bool,
     pub generated_from: String,
+    pub renameable: bool,
 }
 
 impl DetailColumn {
@@ -116,12 +117,10 @@ impl DetailColumn {
         if self.read_only {
             flags.push("read only".to_string());
         }
-        if self.generated {
-            flags.push(if self.generated_from.is_empty() {
-                "generated".to_string()
-            } else {
-                format!("generated from {}", self.generated_from)
-            });
+        if !self.generated_from.is_empty() {
+            flags.push(format!("generated from {}", self.generated_from));
+        } else if self.generated {
+            flags.push("generated".to_string());
         }
         flags
     }
@@ -361,7 +360,7 @@ mod tests {
     }
 
     #[test]
-    fn a_generated_column_says_what_it_came_from_and_cannot_be_renamed() {
+    fn provenance_and_renameability_are_independent() {
         let detail = TableDetailView {
             id: 1,
             name: "contact".to_string(),
@@ -379,6 +378,7 @@ mod tests {
                     generated: false,
                     read_only: false,
                     generated_from: String::new(),
+                    renameable: true,
                 },
                 DetailColumn {
                     name: "work_phone_country".to_string(),
@@ -390,16 +390,34 @@ mod tests {
                     generated: true,
                     read_only: true,
                     generated_from: "work_phone".to_string(),
+                    renameable: false,
+                },
+                DetailColumn {
+                    name: "charge".to_string(),
+                    field_type: "money".to_string(),
+                    sql_type: "NUMERIC".to_string(),
+                    currency: "EUR".to_string(),
+                    quantity_ledger: false,
+                    rounded: false,
+                    generated: true,
+                    read_only: false,
+                    generated_from: "accounting".to_string(),
+                    renameable: true,
                 },
             ],
         };
 
         let renameable = detail.renameable_columns();
-        assert_eq!(renameable.len(), 1);
+        assert_eq!(renameable.len(), 2);
         assert_eq!(renameable[0].name, "work_phone");
+        assert_eq!(renameable[1].name, "charge");
         assert_eq!(
             detail.columns[1].flags(),
             vec!["read only", "generated from work_phone"]
         );
+        assert_eq!(
+            detail.columns[2].flags(),
+            vec!["EUR", "generated from accounting"]
+        );
     }
 }
diff --git a/web/src/pages/admin/table_definition/ui.rs b/web/src/pages/admin/table_definition/ui.rs
index 7e15b0be..ba7d6bfe 100644
--- a/web/src/pages/admin/table_definition/ui.rs
+++ b/web/src/pages/admin/table_definition/ui.rs
@@ -153,6 +153,7 @@ mod tests {
                     generated: false,
                     read_only: false,
                     generated_from: String::new(),
+                    renameable: true,
                 }],
             }),
             history: Vec::new(),