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The box 36 of the T4PS must be reported on line 229 as mentioned on the back of the T4PS slip, see attached slip.PNG. So if the amount was in box 36 of the T4PS it has been reported correctly.
The Canada Revenue Agency (CRA) must be under the mistaken impression you claimed employment expenses on T777 which requires a T2200 which is not the case here.
Unfortunately you must contact CRA to let them know the amount claimed was from a T4PS and not from a T777. You should not need to submit the T2200, just explain the entry on line 229 to CRA so they can close their review.
Hope this helps