That's OK. Its good to have the first flight as AA

However "cpt-dme (through lhr-ba)" will count as CPT-LHR-DME due to the Africa rule. Every flight number counts.

JFK-SYD-AKL-KUL-NRT-DOH-CPT-LHR-DME-HEL-AMS,LHR-MAD-GRU,GIG-JFK in MM
Origin: NYC (us|us-ak|us-hi|ca|pr|vi);
1: JFK-SYD: intercontinental
2: SYD-AKL: 1st of 4 (Southwest Pacific)
3: AKL-KUL: 1st of 1 (intercontinental entry to Asia without immediate transit & departure)
4: KUL-NRT: 1st of 4 (Asia)
5: NRT-DOH: intercontinental
6: DOH-CPT: intercontinental
Rule violated!!!! [CPT-LHR] Max 1 segment(s): Ghana/Nigeria/Kenya/Uganda/Tanzania transit (second EUR entry?)
7: CPT-LHR: intercontinental
8: LHR-DME: 1st of 4 (Europe)
9: DME-HEL: 2nd of 4 (Europe)
Error!!! No oneworld service exists DME-HEL
10: HEL-AMS: 3rd of 4 (Europe)
11: AMS-LHR: surface
12: LHR-MAD: 4th of 4 (Europe)
13: MAD-GRU: intercontinental
14: GRU-GIG: surface
15: GIG-JFK: intercontinental
1 serious error detected. This is likely to be an invalid itinerary (49806 miles)

I will ask SLF (MM author) about this error that was OK on OW tool. And check if S7 fly DME-HEL.This is not in the OW timetable 14 Feb 2014 to 14 March 2014 or 7 March to 4 April. There is SVO-HEL by Finnair. (One of the other Moscow airports) Its hard for SLF to keep the MM routes up to date.

Note: There is no u in Qantas, but quantas.com has been set up for those who cannot spell