Posting from the sub-ledger in Dynamics AX has always been in real-time being when you post an invoice, payment, receipt etc if there was an accounting event then it would hit the ledger. In Dynamics AX 2012 there were new framework’s introduced and one of those was the source document framework. As part of this there now was the ability to control the timing of when the document posts to the ledger. This is controlled in the general ledger by a parameter call the batch transfer rules.
The rules determine if all entries post synchronously like they have always done in AX or at a delayed interval based on the batch processing interval that you setup. This video gives you a quick walk through of the parameter and the affect with purchase receipts.