Quicken can't move a linked checking account if it is already linked to an investment account. The investment account already accounts for cash transactions in the Investing tab. Here is what you can do:
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Transfer all cash transactions into the investment account and delete the linked checking account.
The following terms will be different in the Canadian releases of Quicken.
Canada: "Cheque" / United States: "Check"
Canada: "Colour" / United States: "Color"
Canada: "Centre" / United States: "Center"
Canada: "Realise" / United States: "Realize"
Canada: "Behaviour" / United States: "Behavior"
Canada: "Analyse" / United States: "Analyze"