diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index f96cdac3c..580378925 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -929,6 +929,15 @@ impl SheetApp {
             }
             self.toast = Some((msg, now_ms()));
         }
+        // Point mode can leave another sheet active; the edit belongs to the sheet it started on.
+        if self.session.active().is_some_and(|d| d.wb.active_sheet != ed.sheet)
+            && let Err(e) = self.session.run("sheet.activate", json!({"sheet": ed.sheet}))
+        {
+            self.message = Some(("GridCraft".into(), clean_error(&e)));
+            self.editor = Some(ed);
+            self.session.mode = gridcraft_engine::Mode::Edit;
+            return false;
+        }
         let r = if fill_selection {
             self.session.run("range.fill", json!({"input": text}))
         } else {
diff --git a/crates/ui-egui/src/tabs.rs b/crates/ui-egui/src/tabs.rs
index b77524bb9..8a20f4033 100644
--- a/crates/ui-egui/src/tabs.rs
+++ b/crates/ui-egui/src/tabs.rs
@@ -28,8 +28,8 @@ fn activate_sheet(app: &mut SheetApp, i: usize) {
     if app.editor.as_ref().is_some_and(|e| e.can_point()) {
         let _ = app.session.run("sheet.activate", json!({"sheet": i}));
     } else {
-        if app.editor.is_some() {
-            app.commit_edit(0, 0, false, false);
+        if app.editor.is_some() && !app.commit_edit(0, 0, false, false) {
+            return;
         }
         app.run_or_alert("sheet.activate", json!({"sheet": i}));
     }
@@ -340,8 +340,9 @@ pub fn status_bar(app: &mut SheetApp, ui: &mut Ui) {
 
 #[cfg(test)]
 mod tests {
-    use super::{navigator_items, rename_needs_focus};
+    use super::{activate_sheet, navigator_items, rename_needs_focus};
     use gridcraft_engine::model::{Sheet, Visibility};
+    use serde_json::json;
     use std::sync::Arc;
 
     #[test]
@@ -360,4 +361,24 @@ mod tests {
         let sheets = [Sheet::new("Data"), hidden, very_hidden, Sheet::new("Summary")].map(Arc::new);
         assert_eq!(navigator_items(&sheets), vec![("0".to_string(), "Data".to_string()), ("3".to_string(), "Summary".to_string())]);
     }
+
+    #[test]
+    fn a_rejected_commit_keeps_the_sheet_and_the_edit() {
+        let mut session = gridcraft_engine::Session::new();
+        session.new_workbook();
+        session.execute("home.insertSheet", json!({})).unwrap();
+        session.execute("sheet.activate", json!({"sheet": 0})).unwrap();
+        let rule = json!({"range": "A1", "type": "whole", "operator": "between", "formula1": "1", "formula2": "10"});
+        session.execute("data.validation", rule).unwrap();
+        let mut app = crate::SheetApp::new(session, Default::default());
+        app.begin_edit(Some("99".into()), false);
+        activate_sheet(&mut app, 1);
+        assert_eq!(app.session.active().unwrap().wb.active_sheet, 0, "a value the validation stops must not leave its sheet");
+        assert!(app.editor.is_some(), "the edit stays open to be corrected");
+        app.editor.as_mut().unwrap().text = "7".into();
+        activate_sheet(&mut app, 1);
+        assert_eq!(app.session.active().unwrap().wb.active_sheet, 1, "the corrected value commits and the sheet changes");
+        let a1 = gridcraft_engine::core::CellRef::parse("A1").unwrap();
+        assert!(app.session.active().unwrap().wb.sheet(0).unwrap().cell(a1).is_some(), "the value lands on the first sheet");
+    }
 }
diff --git a/crates/ui-egui/tests/commit_after_pointing.rs b/crates/ui-egui/tests/commit_after_pointing.rs
new file mode 100644
index 000000000..89e1ccd29
--- /dev/null
+++ b/crates/ui-egui/tests/commit_after_pointing.rs
@@ -0,0 +1,54 @@
+//! A formula started on one sheet and pointed at another sheet lands on the sheet it started on.
+
+use egui::vec2;
+use gridcraft_engine::Session;
+use gridcraft_engine::core::CellRef;
+use gridcraft_ui_egui::SheetApp;
+use serde_json::json;
+
+/// Two sheets, `range` selected on the first, and `=1+2` typed there; then pointing moves to the second sheet.
+fn pointing_on_second_sheet(range: &str) -> egui_kittest::Harness<'static, SheetApp> {
+    let mut session = Session::new();
+    session.new_workbook();
+    session.execute("home.insertSheet", json!({})).unwrap();
+    session.execute("sheet.activate", json!({"sheet": 0})).unwrap();
+    session.execute("selection.set", json!({"range": range})).unwrap();
+    let mut h = egui_kittest::Harness::builder().with_size(vec2(1200.0, 800.0)).build_ui_state(
+        |ui, app: &mut SheetApp| {
+            app.logic(ui.ctx());
+            app.ui(ui);
+        },
+        SheetApp::new(session, Default::default()),
+    );
+    h.run_steps(4);
+    h.state_mut().begin_edit(Some("=1+2".into()), false);
+    h.run_steps(2);
+    // Pointing moves to the other sheet without finishing the edit.
+    h.state_mut().session.execute("sheet.activate", json!({"sheet": 1})).unwrap();
+    h
+}
+
+#[test]
+fn commit_after_pointing_on_another_sheet_writes_to_the_origin_sheet() {
+    let mut h = pointing_on_second_sheet("F8");
+    assert!(h.state_mut().commit_edit(0, 0, false, false));
+    let at = CellRef::parse("F8").unwrap();
+    let wb = &h.state().session.active().unwrap().wb;
+    assert_eq!(wb.active_sheet, 0, "the origin sheet is shown again");
+    assert!(wb.sheet(0).unwrap().cell(at).is_some_and(|c| c.formula.is_some()), "formula written on the origin sheet");
+    assert!(wb.sheet(1).unwrap().cell(at).is_none(), "the pointed-at sheet is untouched");
+}
+
+#[test]
+fn ctrl_enter_after_pointing_on_another_sheet_fills_the_origin_selection() {
+    let mut h = pointing_on_second_sheet("B2:C3");
+    assert!(h.state_mut().commit_edit(0, 0, false, true));
+    let wb = &h.state().session.active().unwrap().wb;
+    assert_eq!(wb.active_sheet, 0, "the origin sheet is shown again");
+    for a1 in ["B2", "C2", "B3", "C3"] {
+        let at = CellRef::parse(a1).unwrap();
+        assert!(wb.sheet(0).unwrap().cell(at).is_some_and(|c| c.formula.is_some()), "{a1} filled on the origin sheet");
+        assert!(wb.sheet(1).unwrap().cell(at).is_none(), "{a1} on the pointed-at sheet is untouched");
+    }
+    assert!(wb.sheet(1).unwrap().cell(CellRef::parse("A1").unwrap()).is_none(), "the pointed-at sheet's selection is untouched");
+}