Hello, my clients are complaining that when I send them change orders. it's the same invoice number. can you please change this feature?

when I put in the change order. I can see a change order number next to my invoice. but my client dont.

Example . Invoice 511- 113 (the last 3 are the change order) this should reflect to the client. please make this change asap. it's important and Im sure Im not the only one.