diff --git a/db/routines/vn/triggers/entry_beforeUpdate.sql b/db/routines/vn/triggers/entry_beforeUpdate.sql
index 98ebe1364..d56db5e01 100644
--- a/db/routines/vn/triggers/entry_beforeUpdate.sql
+++ b/db/routines/vn/triggers/entry_beforeUpdate.sql
@@ -6,9 +6,19 @@ BEGIN
 	DECLARE vIsVirtual BOOL;
 	DECLARE vPrintedCount INT;
 	DECLARE vHasDistinctWarehouses BOOL;
+	DECLARE vTotalBuy INT;
 	
 	IF NEW.isBooked = OLD.isBooked THEN
 		CALL entry_checkBooked(OLD.id);
+	ELSE
+		IF NEW.isBooked THEN
+			SELECT COUNT(*) INTO vTotalBuy
+				FROM buy
+				WHERE entryFk = NEW.id;
+			IF NOT vTotalBuy THEN
+				CALL util.throw('Entry must have lines to be marked booked');
+			END IF;
+		END IF;
 	END IF;
 
 	SET NEW.editorFk = account.myUser_getId();
@@ -16,7 +26,7 @@ BEGIN
 	IF NOT (NEW.travelFk <=> OLD.travelFk) THEN
 
 		IF NEW.travelFk IS NOT NULL AND NOT travel_hasUniqueAwb(NEW.travelFk) THEN
-			CALL util.throw('The travel is incorrect, there is a different AWB in the associated entries');	
+			CALL util.throw('The travel is incorrect, there is a different AWB in the associated entries');
 		END IF;
 	
 		SELECT COUNT(*) > 0 INTO vIsVirtual