Sequence of procedures in ABN/EMER is written in FCTM/AOP/Management of Abnormal Ops/Sequence of procedures, however it's with "should" not "shall"
1. Memory items or OEB immediate actions
2. OEB
3. ECAM
4. QRH
Also, FCTM/PROC/ABN-EMER/F/CTL under 'Failure during the approach' states that crew "will":
1. Pull the speed
2. Delay the app to complete ECAM
3. Refer to QRH - Flaps/Slats Jammed
4. Update the briefing