Posting Date in SOP Open File

These are the types of questions you get when you are on vacation. :)

Client email came questioning the inconsistency of the GL Posting Date on Sales Order invoices in GP (2010.)  Apparently some invoices have a posting date, others don't (as can be seen on the Edit reports.)

In examining the data I don't see any rhyme or reason why an unposted Sales Order invoice has a posting date or does not have one, but they surely do both.  I cannot discern from the data what would trigger the posting date to appear.  Further more what relevance does GL Posting Date have to an unposted invoice?

My response to the client: it is not clear to me why this was happening but it should not interfere with posting.

If anyone happens to have any information on this please share!