Opportunity Stage cannot be changed backwards :-
38426
Excluding System admin from this validation rule
149361
Syncing content between stage and prod
74387
Can the warp drive be run in reverse?
116843
Undoing an old vote cannot be recast because vote is too old
15501
How to update Opportunity Line Item product on a related custom object?
128601
Can a shove give an Opportunity Attack?
76383
Is it possible to change your spawn point?
9906
Cannot tap top right reputation change indicator
78829
Can you move backwards 4 spaces right outside of the safety zone?
5697
Can I choose to delay my turn in combat?
45423
Why can't I recast aged close votes and flags that were cast a long time before the change allowing recasting?
60317
How can I reset my Ability Points?
103637
How do I change the runlevel?
24321
When can I make opportunity attacks?
141573
Return opportunities with child opportunities
152985
When does dodge chance take effect?
101053
How to change process priority