Guidance?

[johnnyrao]

I worked a summer HS basketball tournament this weekend. Team A had an inbounds play under their basket. I was lead. I started my count and called a 5 second violation. The Trail came to me and told me that I made a mistake because he had his hand up indicating subs were coming into the game so I should not have administered the throw-in. I agree I made a huge mistake here. But, he then told me we should give the ball back to Team A since I made a mistake. I told him I didn't think we could because it's not a correctable error. It's an error on my part but I still gave A1 a full five seconds to get the throw in on the court. He told me to do whatever I wanted to do but he just wanted to point it out to me. I gave the ball to B because of the violation and we went on. Is this correct or could we have gone back and done it again?