diff --git a/mysql/migration/2.0.0-2.1.0.sql b/mysql/migration/2.0.0-2.1.0.sql
index f18947c8606..2aaac2565d8 100644
--- a/mysql/migration/2.0.0-2.1.0.sql
+++ b/mysql/migration/2.0.0-2.1.0.sql
@@ -482,6 +482,6 @@ alter table llx_facturedet_rec add column total_ttc real;
 -- V4 DELETE llx_boxes FROM llx_boxes LEFT JOIN llx_boxes_def ON llx_boxes.box_id = llx_boxes_def.rowid WHERE llx_boxes_def.rowid IS NULL;
 
 ALTER TABLE llx_boxes ADD INDEX idx_boxes_boxid (box_id);
-ALTER TABLE llx_boxes ADD CONSTRAINT fk_boxes_box_id FOREIGN KEY (box_id) REFERENCES llx_boxes_def (rowid);
+-- V4 ALTER TABLE llx_boxes ADD CONSTRAINT fk_boxes_box_id FOREIGN KEY (box_id) REFERENCES llx_boxes_def (rowid);
 
 ALTER TABLE llx_boxes ADD INDEX idx_boxes_fk_user (fk_user);
diff --git a/mysql/tables/llx_boxes.key.sql b/mysql/tables/llx_boxes.key.sql
index 4a3c57a4e3e..eff1dd77edf 100644
--- a/mysql/tables/llx_boxes.key.sql
+++ b/mysql/tables/llx_boxes.key.sql
@@ -24,6 +24,6 @@
 -- V4 DELETE llx_boxes FROM llx_boxes LEFT JOIN llx_boxes_def ON llx_boxes.box_id = llx_boxes_def.rowid WHERE llx_boxes_def.rowid IS NULL;
 
 ALTER TABLE llx_boxes ADD INDEX idx_boxes_boxid (box_id);
-ALTER TABLE llx_boxes ADD CONSTRAINT fk_boxes_box_id FOREIGN KEY (box_id) REFERENCES llx_boxes_def (rowid);
+-- V4 ALTER TABLE llx_boxes ADD CONSTRAINT fk_boxes_box_id FOREIGN KEY (box_id) REFERENCES llx_boxes_def (rowid);
 
 ALTER TABLE llx_boxes ADD INDEX idx_boxes_fk_user (fk_user);
\ No newline at end of file