This same happened to me but I didn't have any self-employment form, nor did I have any self employment job. I also checked my T4 slips and all of them are AB
@jnpcsl If you've entered an amount from any of the boxes on the slips listed here, you have what the CRA considers to be self-employment or business income:
T4 slip: box 81, 82 or 83
T4A slip: box 20 or 48
T4A slip: box 28 and you answered Yes to the question Does the income declared in Box 028 consist of fees collected for services you provided? in TurboTax Online
T3 slip: box 24 (foreign business income)
If you have an amount in any of these boxes, TurboTax will ask additional questions to report the income as self-employment/business income. You only need to answer basic information, such as business name and address (can be your own), industry code, and fiscal period (Jan 01 to December 31).