The setting on this screen determines the 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 AP Approval Screen and for Auto Approval of POs. If Auto Approve Completed POs is checked for the division, (under Setup > Division > Purchasing > PO Approval Options), the accounting date nominated by this setting is used. If a PO is taken off accounting hold, the accounting date is changed to the date nominated by this setting.
Access the Integration menu > Timberline Accounting > Accounting DB Settings.
Or, select the Accounting DB Settings 
icon from the toolbar.
By default, the Send to Timberline Accounting Options tab opens.
Verify the database currently selected in the Accounting Databases field list is the correct database for which this setting will be defined. If necessary, click on a different database.
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.
Under Payment Date Range Validation, select whether to use payments date validation. If payment date validation is selected:
enter the number of days before and after the Accounting Date, for which an invoice payment date will be valid. Invoices will not be able to be entered into the Payments Manager if the payment date falls outside this range.
Click on Save.
Division Settings PO Approval Options
Approve Payment of Purchase Orders
Change Accounting Date on Approved Invoice