In my case, think of country club billing.  Members incur charges daily.  Sometimes the charges get entered right away.  Sometimes the charges get entered at the end of the month when we collect honor bar logs, etc.  What would be ideal is that the date the member charged something was the Service Date and the date we entered the charge the "Posting" date.  But members only get billed monthly for ALL their charges that month, so we have a many-to-one relationship between charges and invoices.  (In my case, it's worse.  We only bill quarterly but want to recognize revenue monthly.  So I have to create three "invoices" each quarter as that triggers when the posted charge actually becomes revenue in QBO.  Then I send a statement representing three months invoices.)  If the Service Date was available as a filter for adding posted charges to invoices, this would all work.  But they only present charges by Posting date (what they call Delayed Charge Date) which means you can't tell which services to drop into which month's invoice when you're billing so far in arrears.  I have simply solved the problem by ignoring Service Date.  I would turn if back off in Settings if i trusted it not to wreck my data, which I don't.  Now I simply change the Delayed Charge Date to be the actual date of service when I post charges, and everything works.  Hope this helps.