Its month end and when you come to reconcile the General Ledger control accounts to Receivables or Payables there’s a difference! You check all the usual things like unposted General Ledger batches or manual journals that may have been inadvertently posted to a control account, but this proves fruitless. So where do you start from there? Checkout this post from Microsoft for details:
thedynamicsexplorer.com/2019/05/02/dynamics-gp-4-steps-to-help-reconcile-general-ledger-to-receivables-or-payables/