Transactions not showing up in linked checking account

I have an Ameritrade account with a linked checking account. For the past 5 months or so I used downloaded transactions but turned that off today since
I prefer to enter them manually. My problem is that for March the downloaded transaction to add interest to the money market account associated with the investment account had an amount of zero instead of the actual amount. When I tried to edit the amount in the cash account Quicken popped up and told me to edit the linked transaction in the investment account. When I changed that transaction amount to the true cash amount and number of money market shares, the companion cash transaction disappeared. I then deleted the investment account transaction and manually added it. The cash transaction was not created. How does the cash account work? Do I have to always add two separate transactions? How do they get linked?
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Brian Whiting wrote:

The purpose of a linked cash account is to hold *true* cash. Money market mutual funds may seem like cash, you may think of them as cash, but they aren't cash.
Only transactions that would add cash to the investment account or remove cash from the investment account will affect a linked cash account. A "Buy" transaction will remove cash; a Sell transaction will generate cash; an "interest" transaction will generate cash (whether associated with a security or not) ... a "reinvestment" transaction will not not have any effect on cash.
You can not track a mm fund as a security *and* see its value as "cash" at the same time; choose one or the other.
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John Pollard
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