Booked AA award -AA DFW-EWR connecting to BA EWR-LHR-VCE beginning September 9.

I know I can do OLCI on AA.com for 1st flight.......but not sure about the BA segments. When I go to my BAEC account the flights are accessible there and indicate I can do OLCI beginning with my second segment EWR-LHR.

However on my BA manage My Booking page it lists flight 1 as EWR-LHR, flight 2 as DFW-EWR and flight 3 as LHR-VCE.

1. Is this going to an issue or problem? It does not seem logical that my Dallas flight to Newark to connect to my flight to London is showing as my second flight.

2. After I do OLCI for my DFW-EWR flight on AA.com can I then complete OLCI on BA.com for the BA segments?

Or can I do it on AA.com or is it done at DFW airport?

My AA.com Itinerary is in the correct order.