The code you are referring to appears based on how information has been entered.
The 'SCH' code is listed when you have entered details on scholarships and grants within Deductions & Credits - Education. This section includes and area for scholarships/grants received as well as entry of expenses. If your earned amount is greater than expenses, you will see the difference on Line 7 of your 1040 with the SCH next to the amount.
However, if you entered your information under Wages - Less Common Income - Miscellaneous Income, then the amount of your income will appear without the code.