If equivalent dower is 100,000 but 300,000 was named, what is the stated rule for an interdicted safih?

Kitab al-Hajr: Improvidence, Legal Restriction, and the Age of 25

• All 300,000 necessarily bind
• 100,000 equivalent dower applies; the 200,000 excess is ineffective
• No dower is due
• Only 20,000 is due