Drive Other Car Coverage Subject to a Deductible?

Our insured has a business auto policy with endorsement CA 99 10, drive other car coverage, attached. The CEO of the insured company rents cars for his own use and for his wife's use. The CEO damaged his car while backing out from a parking space; he ran into a light pole. The adjuster says there is no problem with coverage for the damage, but he wants to apply a deductible. We don't see any deductible listed on CA 99 10, so we were wondering if any deductible is applicable to this claim. What is your opinion?

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