I get a Warning message but have not found a way to remove the deduction. that appears as a Deduction for Workers on Line 201.
You should not confuse Employment Expenses form T777 & TP59 (you need your employer to provide you forms T2200 & TP-64.3), deduction for workers from line 201 of your TP1 and the tax credits respecting the Work Premium from line 456 of your TP1. Bottom line, you might be entitled to the deduction for workers even if you are a full-time student.