We have come across an issue where the Purchase Order invoices vouchers are doubled in the G/L in Microsoft Dynamics AX 2012.
In customer environment, the Batch Transfer rules selected in the G/L was Scheduled Batch and the Summarize accounting entries had the option "Yes".
We verified that partner solved the issue installing KB 2758624. This KB originally addresses another issue, similar but not equal, that is: system does not summarize transactions when you update the G/L.
Installing it, it had the side effect to correct also the Customer issue (Note: the result may change according to specific G/L setup).
As for all the KB fixes, the correction is not retroactive and users should correct wrong vouchers already posted manually. An efficient way to do this activity is the following one:
a) Run the Vendor/Ledger reconciliation report
b) Identify the differences
c) Create and post G/L journals (only for Ledger, not involving Vendors), in order to re-align the G/L and the A/P.
The Finance department users should choose if doing one G/L transaction per each vendor/period or only one transaction per period/accounts Payable ledger account .