F0018 Order Date is not Invoice Date

Hi -

Can anyone tell me if the Tax table is working as designed?  It doesn't seem right to me.  When an invoice is entered with and invoice date different than the G/L Date which is different than the date the transaction was posted, it enters the date the transaction was posted as the order date in the tax table.

Steps to recreate:

1. enter an A/R invoice with VAT.  Enter Invoice Date = 11/1/16; G/L Date = 11/5/16 and Service Tax Date = 10/31/16
2. Post the invoice (processing options set to write to tax table - all Tax Explanation Codes)
3. View the data in the F0018.  The G/L Date and Service/Tax Date are OK but the Order Date = today's date (date it was posted).  There are no other dates in the table so the actual invoice date is not stored anywhere.