The manual says :
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Declare Stake Can be used on a region if another is changing status to Protectorate or Colony (both of which “Allow Stake” and provide a message in the Message Log) and you have enough CP to contest it. May provoke a Crisis. 15-100 CP: £50, 1 Diplomat, 2TA. 50% chance to trigger crisis against region owner or power present with bad relations if you are the owner.
Main problem is that when a country tries to switch from infklueced to colony the colony card lacks the stakble atribute :
Attributes = *AllowStake*