diff --git a/sao/src/view/form.js b/sao/src/view/form.js
index 7c113038b0..8620ede908 100644
--- a/sao/src/view/form.js
+++ b/sao/src/view/form.js
@@ -3618,6 +3618,10 @@ function eval_pyson(value){
             var context = this.field.get_search_context(this.record);
             domain = [domain,
                 this.record.expr_eval(this.attributes.add_remove)];
+            let existing_ids = this.field.get_eval(this.record);
+            if (existing_ids.length) {
+                domain = [domain, ['id', 'not in', existing_ids]];
+            }
             var removed_ids = this.field.get_removed_ids(this.record);
             domain = ['OR', domain, ['id', 'in', removed_ids]];
             var text = this.wid_text.val();
@@ -3909,6 +3913,10 @@ function eval_pyson(value){
             var domain = this.field.get_domain(this.record);
             domain = [domain,
                 this.record.expr_eval(this.attributes.add_remove)];
+            let existing_ids = this.field.get_eval(this.record);
+            if (existing_ids.length) {
+                domain = [domain, ['id', 'not in', existing_ids]];
+            }
             var removed_ids = this.field.get_removed_ids(this.record);
             domain = ['OR', domain, ['id', 'in', removed_ids]];
             return Sao.common.update_completion(
@@ -4169,6 +4177,10 @@ function eval_pyson(value){
             if (!jQuery.isEmptyObject(add_remove)) {
                 domain = [domain, add_remove];
             }
+            let existing_ids = this.field.get_eval(this.record);
+            if (existing_ids.length) {
+                domain = [domain, ['id', 'not in', existing_ids]];
+            }
             var context = this.field.get_search_context(this.record);
             var order = this.field.get_search_order(this.record);
             var value = this.entry.val();
@@ -4327,6 +4339,10 @@ function eval_pyson(value){
             if (!jQuery.isEmptyObject(add_remove)) {
                 domain = [domain, add_remove];
             }
+            let existing_ids = this.field.get_eval(this.record);
+            if (existing_ids.length) {
+                domain = [domain, ['id', 'not in', existing_ids]];
+            }
             return Sao.common.update_completion(
                 this.entry, this.record, this.field, model, domain);
         },
diff --git a/tryton/tryton/gui/window/view_form/view/form_gtk/many2many.py b/tryton/tryton/gui/window/view_form/view/form_gtk/many2many.py
index b76a0386e0..8cdfd10a38 100644
--- a/tryton/tryton/gui/window/view_form/view/form_gtk/many2many.py
+++ b/tryton/tryton/gui/window/view_form/view/form_gtk/many2many.py
@@ -177,6 +177,9 @@ class Many2Many(Widget):
         add_remove = self.record.expr_eval(self.attrs.get('add_remove'))
         if add_remove:
             domain = [domain, add_remove]
+        existing_ids = self.field.get_eval(self.record)
+        if existing_ids:
+            domain = [domain, ('id', 'not in', existing_ids)]
         context = self.field.get_search_context(self.record)
         order = self.field.get_search_order(self.record)
         value = self.wid_text.get_text()
@@ -369,6 +372,9 @@ class Many2Many(Widget):
         add_remove = self.record.expr_eval(self.attrs.get('add_remove'))
         if add_remove:
             domain = [domain, add_remove]
+        existing_ids = self.field.get_eval(self.record)
+        if existing_ids:
+            domain = [domain, ('id', 'not in', existing_ids)]
         update_completion(
             self.wid_text, self.record, self.field, model, domain)
 
diff --git a/tryton/tryton/gui/window/view_form/view/form_gtk/one2many.py b/tryton/tryton/gui/window/view_form/view/form_gtk/one2many.py
index fb5ed79f46..3c299c3fd3 100644
--- a/tryton/tryton/gui/window/view_form/view/form_gtk/one2many.py
+++ b/tryton/tryton/gui/window/view_form/view/form_gtk/one2many.py
@@ -506,6 +506,9 @@ class One2Many(Widget):
         domain = self.field.domain_get(self.record)
         context = self.field.get_search_context(self.record)
         domain = [domain, self.record.expr_eval(self.attrs.get('add_remove'))]
+        existing_ids = self.field.get_eval(self.record)
+        if existing_ids:
+            domain = [domain, ('id', 'not in', existing_ids)]
         removed_ids = self.field.get_removed_ids(self.record)
         domain = ['OR', domain, ('id', 'in', removed_ids)]
         text = self.wid_text.get_text()
@@ -612,6 +615,9 @@ class One2Many(Widget):
         model = self.attrs['relation']
         domain = self.field.domain_get(self.record)
         domain = [domain, self.record.expr_eval(self.attrs.get('add_remove'))]
+        existing_ids = self.field.get_eval(self.record)
+        if existing_ids:
+            domain = [domain, ('id', 'not in', existing_ids)]
         removed_ids = self.field.get_removed_ids(self.record)
         domain = ['OR', domain, ('id', 'in', removed_ids)]
         update_completion(self.wid_text, self.record, self.field, model,