From the Release Notes included with the update: 

New in PR2.21.0.0
Employee records are no longer dropped during Payroll conversion from legacy to new Payroll
on Premium when in legacy employees are assigned a Benefit Code with Annual Limit of
99,999.00.
1
DevID 111005 Knowledgebase ID 99553
When reversing a payroll check using the Reverse Check button in Payroll Data Entry, the
default check date populated is the date of the original check but you can now manually change
the check date.
2
DevID 112333 Knowledgebase ID 106526
Error: "Error 15 SY_Maint.pvc 455" no longer occurs in Employee Maintenance when the Time
Off Annual Limit is 99,999.00.
3
DevID 112383 Knowledgebase ID 106893
Only the employee records populate the ACH file when Include Only Employee Records option
is selected in Direct Deposit Maintenance.
4
DevID 112451 Knowledgebase ID 107296
"The amount does not equal the rate multiplied by the hours" will no longer display on Payroll
Data Entry Audit Report for Salaried employees that are rounded.
5
DevID 112461 Knowledgebase ID 107352
Payroll Check History Report now retains the earnings/deduction code selections when saving a
report setting.
6
DevID 112467 Knowledgebase ID 107351
In order to calculate the Ohio Courtesy taxes a negative percent can now be entered in the
Override % column on the Taxes tab in Employee Maintenance.
7
DevID 112470 Knowledgebase ID 103721
Accrual Percentage field is now enabled on the Payroll Expense and Tax Accrual screen during
Payroll Check Register Update when the accrual date is changed.
8
DevID 112473 Knowledgebase ID 99805
1
The new Offer of Coverage Codes and the new Health Coverage Code for Individual Coverage
Health Reimbursement Arrangement (HRA) have been added for Affordable Care Act (ACA)
reporting.
9
DevID 112565

From the Release Notes included with the update: 

New in PR2.21.0.0
Employee records are no longer dropped during Payroll conversion from legacy to new Payroll
on Premium when in legacy employees are assigned a Benefit Code with Annual Limit of
99,999.00.
1
DevID 111005 Knowledgebase ID 99553
When reversing a payroll check using the Reverse Check button in Payroll Data Entry, the
default check date populated is the date of the original check but you can now manually change
the check date.
2
DevID 112333 Knowledgebase ID 106526
Error: "Error 15 SY_Maint.pvc 455" no longer occurs in Employee Maintenance when the Time
Off Annual Limit is 99,999.00.
3
DevID 112383 Knowledgebase ID 106893
Only the employee records populate the ACH file when Include Only Employee Records option
is selected in Direct Deposit Maintenance.
4
DevID 112451 Knowledgebase ID 107296
"The amount does not equal the rate multiplied by the hours" will no longer display on Payroll
Data Entry Audit Report for Salaried employees that are rounded.
5
DevID 112461 Knowledgebase ID 107352
Payroll Check History Report now retains the earnings/deduction code selections when saving a
report setting.
6
DevID 112467 Knowledgebase ID 107351
In order to calculate the Ohio Courtesy taxes a negative percent can now be entered in the
Override % column on the Taxes tab in Employee Maintenance.
7
DevID 112470 Knowledgebase ID 103721
Accrual Percentage field is now enabled on the Payroll Expense and Tax Accrual screen during
Payroll Check Register Update when the accrual date is changed.
8
DevID 112473 Knowledgebase ID 99805
1
The new Offer of Coverage Codes and the new Health Coverage Code for Individual Coverage
Health Reimbursement Arrangement (HRA) have been added for Affordable Care Act (ACA)
reporting.
9
DevID 112565

Appreciate your reply but do not see an ID above that refers to changes in the check format.