Batting out of order/sub.

Question
Two part question.
Batter-3 is suppose to bat, but was injured. Coach brings in a substitute for B-3. The coach ask the umpire that the substitute was going to be placed at the end of the line up and that he would move everyone else up one in the batting line up. I know that this is wrong,but it was aloud by the umpire. The other thing is that the other team did not figure this out until number-6 batter was up to bat and now they wanted batting out of order. What do we have now? Batting out of order or do we change it to the correct order or does it stay as the proper-improper batting order. Help the confused!!!

Answer
B4 batted when B3 should have.  Once a pitch was thrown to B5, B4's at bat can not be challenged.  B3 effectively has been skipped.  If the defense wanted batting out of order, they had to same something prior to B5 receiving a pitch.  Since this was figured out when B6 was up no penalty.

The umpire created a potential problem with how he handled the sub, but the defensive team bailed him out my not recognizing the problem in time.

Tom