# How to Run Period End Close in M3 > Source: https://netray.co/erp-help/m3-period-end-close-checklist-how-to > Publisher: Netray (netray.co), AI and integration engineering for ERP and manufacturing systems. > Section: ERP Help ## Short answer M3 period end close is not a single button - it is a sequence: close sub-ledger activity in inventory, purchasing and sales first, reconcile and post any pending vouchers, then close the accounting period in the financials basic data so no further postings can hit it without explicit reopening. Doing the steps out of order is the most common reason a company has to reopen a period after close. ## Kind how-to ## System infor-m3 ## Erp Infor M3 (M3 Business Engine) ## Module Financials / Period Close ## Query How do I run period end close in M3 ## Alternate Queries - M3 month end close checklist - M3 accounting period close process - how to close an accounting period in M3 - M3 sub-ledger to GL close order ## Applies To Infor M3 Business Engine 10.x-14.x, Financials, Inventory, Purchasing and Order modules ## Steps ### Run a clean M3 period close **Items:** Confirm all inventory transactions for the period are posted - receipts, issues, cycle count adjustments and manufacturing order reporting should be complete before you look at closing anything. Review and clear any transactions sitting in error or suspense queues (MMS statistics update, cost update jobs) so they do not post into the wrong period once it changes. Close purchasing activity for the period: match and post supplier invoices via APS100 (Supplier Invoice. Record) so accrued but unmatched receipts are identified before period close, not after. Close order/billing activity for the period: confirm customer orders that should be invoiced in this period have gone through OIS300 invoicing and posted to the ledger. Run any standard cost update or inventory valuation jobs required by your costing method so inventory value on the balance sheet reflects the period's activity. Reconcile sub-ledger totals (AP, AR, inventory) against the general ledger control accounts before touching the period status - this is the step that catches most real close problems. Post any manual GL vouchers via GLS100 needed for accruals, depreciation or adjusting entries for the period. Update the accounting period status in the Financials basic data so the period is closed to further transaction posting, and communicate the new open period to all transacting modules. Keep a rollback plan - know which period status change and which vouchers would need to be reversed if a late-arriving transaction forces you to reopen the period. ## Sections ### Why order matters: sub-ledgers before GL **Body:** M3, like most ERPs, posts sub-ledger activity (inventory movements, supplier invoices, customer invoices) into the general ledger through automated voucher creation. If the accounting period is closed to new postings before all sub-ledger activity for the period is finished, those late transactions either fail to post, post into the wrong (next open) period, or generate an error queue that has to be manually reconciled - all three outcomes create more work than closing in the right order the first time. The practical discipline most M3 shops use is a hard cutoff communicated to warehouse, purchasing and order entry teams a day or two before financial close: no more receipts, invoices or shipments should be dated into the closing period after that cutoff unless finance explicitly approves a late entry. ### Reconciling sub-ledger to GL before closing **Body:** The single highest-value step in the checklist is reconciling inventory value, AP and AR sub-ledger totals against their GL control accounts before changing period status. A mismatch caught here is a same-day fix; a mismatch discovered after the period is closed and the next period has started often requires either a reversing entry in the new period or reopening the closed one, both of which complicate audit trail and reporting for that quarter. ### Reopening a closed period **Body:** M3 does allow a closed accounting period to be reopened for correction, but it should be treated as an exception process with controlled access, not a routine fix - reopening after downstream reports, tax filings or consolidations have already used the closed period's balances can force those to be rerun. Most finance teams restrict who can change period status and require a documented reason before a reopen happens. ## Pitfalls - Closing the accounting period before all supplier invoices for the period are matched and posted, leaving accrued liability misstated. - Closing before customer order invoicing (OIS300) for the period is finished, which understates period revenue. - Skipping the sub-ledger to GL reconciliation step and only discovering a mismatch during external audit review. - Not communicating the close cutoff to warehouse and order entry teams, who keep dating transactions into a period that finance is about to close. - Reopening a closed period without a controlled process, then forgetting to re-run downstream consolidation or reporting that already used the old closed balances. - Running standard cost updates after period close instead of before, which shifts inventory valuation into the wrong period. ## Ai Angle ERPray, grounded in the company's M3 financial and sub-ledger tables, can run the reconciliation checks that normally take a controller an afternoon - comparing inventory sub-ledger totals to the GL control account, listing unmatched supplier invoices, or flagging orders that should have been invoiced in the closing period - and surface just the exceptions that need a human decision, rather than a full manual walk through every module. ## Faq ### What is the right order to close an M3 period in? **Answer:** Close operational sub-ledgers first - inventory, purchasing invoice matching, and order invoicing - reconcile those totals to the general ledger control accounts, post any manual adjusting vouchers, and only then change the accounting period status to closed. ### Can a closed period be reopened in M3? **Answer:** Yes, M3 supports reopening a closed accounting period for correction, but it should be access-controlled and treated as an exception, since anything that already consumed the closed period's balances (reports, consolidations, tax filings) may need to be rerun. ### What causes the most period close delays in M3? **Answer:** Unmatched supplier invoices and orders that should have been invoiced in the period but were not processed in time are the two most common delays, followed by inventory transactions still sitting in error queues from failed cost updates. ### Does M3 automatically stop transactions from posting into a closed period? **Answer:** Once the accounting period status is set to closed, M3 blocks new GL postings dated into that period from the standard financial programs, though sub-ledger transactions dated into a closed period can still generate errors that need manual handling rather than posting silently. ## Search terms M3 period end close, M3 month end close checklist, M3 accounting period close, M3 sub-ledger GL reconciliation, M3 close accounting period, M3 GLS100 voucher, M3 APS100 supplier invoice, M3 reopen closed period --- Talk to an engineer: https://netray.co/contact?intent=erp_ai | Machine catalog: https://netray.co/agent/catalog.json