Posting date on current fiscal period, Billing date and Document date on previous fiscal period

Dear Experts,

When releasing accounting document for billing document under sales and distribution process, business user requested that document date on accounting document was copies from billing date of billing document and posting date on accounting document was picked the current date.

For examples, billing date on billing document is Jan 13, 2014. I released the billing document to accounting on Feb 14, 2014. Business users require is that accounting document was posted to FI on Feb 14, 2014 and document date of accounting document was on Jan 13, 2014.

How do we achieve and satisfy for the requirement?

Thanks.