AOM is Advisory on Marriages from NSO, its the opposite of CENOMAR. When you ask for CENOMAR from NSO, and they find in their records that u r married, they will give you an AOM. It is in the checklist (country specific guide). Another thing they ask for is Appendix A , i think it is for info on dependents or family members (i think.. im not sure coz i have no PPR yet) yes, these info are given in the IMM forms already but they ask for this still during PPR. and this is different from the appendix a-checklist we have in the country specific forms.
Also I have read cases that they ask for additional proof such as photos BEFORE (old photos) and AFTER wedding coz some send in wedding photos only (and mayUbe little of other forms of evidences) They also ask for baptismal and school records if they see that the applicant has late registration of birth. hope this answers your q, dadaem =)