The setting on this screen determines the accounting date to use when approving POs. This setting has no impact on invoice date (accounting date and invoice date are not the same in WMS).
There is an option to use the current date as the Accounting date, or the user can select a date to be used by the either of the purchase order and invoice approval workflows. For more information on the use of the accounting date in the purchase order and invoice approval workflows see Payments.
Access the Integration menu > Accounting > Accounting Integration Settings.
Or, select the Accounting Integration Settings 
icon from the toolbar.
Verify the accounting company currently selected in the Accounting Companies grid is the correct accounting company for which this setting will be defined. If necessary, click on a different accounting company.
Click the PO Approval Options tab.
Under Accounting Date for PO Approvals:
select whether to use the current date or nominate a different date. If a different date is nominated, it will be necessary to update that information regularly.
if Nominate Accounting Date is selected, the setting to Automatically update Accounting date on invoices not sent to accounting will be available. If this setting is checked and the Nominated Accounting Date is changed, the accounting date on invoices not sent to accounting which have an accounting date EARLIER than the new Nominated Accounting Date will have their accounting dates updated to the new Nominated Accounting Date.
Under Payment Date Range Validation, select whether to use payments date validation. If payment date validation is selected:
enter the number of days Before the Accounting Date, for which an invoice payment date will be valid. Invoices will not be able to be entered into the Invoice Manager if the payment date falls before this date range.
enter the number of days After the Accounting Date, for which an invoice payment date will be valid. Invoices will not be able to be entered into the Invoice Manager if the payment date falls after this date range.
Click the Save 
button at the top of the screen to save any changes.
Accounting Integration Settings
Division Settings PO Approval Options
Approve Payment of Purchase Orders
Change Accounting Date on Approved Invoice