What is the Ruling?

[bsktball_ref]

I understand your post.

This is a correctable error as in 2-10-4.

"If the error os a free throw by the wrong player or at the wron basket, or the awarding of an unmerited free throw, the free throw and the activity during it, other than unsporting, flagrant, intentional, or technical fouls, shall be cancelled"

A lane violation is "activity other than unsporting, flagrant, intentional, or technical fouls". Therefore it is cancelled. However unfortunate for team A, the correct Team B shooter will get the 1+1 oppportunity.

If you cannot confirm the correct shooter then you have the violation standing and A's ball at the endline for the violation at the front end of a 1+1.