As you describe it, there were two separate debits to cash. One was a deposit. The other was one side of a currency exchange. As they were conducted at the same time with the same teller, the bank "knows" and aggregation is mandatory. The $11500 CTR would indicate a deposit was made by checking box 34 and an exchange took place by checking box 33. "Multiple transactions" would be checked at the top of the form.
Some banks fill out debits and credits for currency exchanges or post them to the teller machine. Some do not. My opinion is that there should be a record of any currency exchange above $XX (amount established by policy).
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In this world you must be oh so smart or oh so pleasant. Well, for years I was smart. I recommend pleasant.