Regiona Tax Calculation Card missing More than one employer or payer at the same time

Summary:

We are implementing 26C release item - Tax Credit Information Enhancements. I understand that for for Federal, Manitoba, and Yukon, the Basic Personal Amount is editable because the values are not fixed (they are dynamic). For all other provinces, the Basic Personal Amount is fixed and is read-only. However, in SK and other provinces employees should be filling claiming zero in the situation below. How is everyone being compliant as we can't modify those fields and I don't see an exempt Regional check box to pick.

If you have more than one employer or payer at the same time and you have already claimed personal tax credit amounts on another Form TD1SK