hey all, can anyone point me to some documentation on posting transactions in a different period than the current one. (invoice received 1st of july is for costs of June, and should be posted in June)

For me: The earliest period possible that's open that doesn't have an impact on management accounts already sent out for the sole reason that the Netsuite Date field is what is picked up in tax reports. This will mean late invoices will be picked up in subsequent tax returns. Some places might have both posting date (Netsuite date field) and tax point date field.