Why is the final component written with fatḥah after إِلَى?

Al-Murakkabāt — Compound Numerals, the Twelve Exception and Declining Baalbek

• سَافَرْتُ is an imperative
• Baalbek is the number eleven
• إِلَى governs genitive; the diptote takes fatḥah
• Baalbek is an inna predicate