# Infor LN Item Group: Setup and Maintenance > Source: https://netray.co/erp-help/infor-ln-item-group-setup-and-maintenance > Publisher: Netray (netray.co), AI and integration engineering for ERP and manufacturing systems. > Section: ERP Help ## Short answer An item group in Infor LN classifies items so that defaults, accounting and reporting can be applied by group instead of item by item. You maintain them in the Item Groups session (tcmcs023m000 in common data) and assign each item to one group in the item base data. Plan the group structure before loading items, because changing it later affects accounting defaults and history. ## Kind how-to ## System infor-ln ## Erp Infor LN ## Module Common / Item Base Data ## Query infor ln item group ## Alternate Queries - infor ln item groups session - infor ln create item group - infor ln item group tcmcs023 ## Applies To Infor LN 10.x and ERP LN 6.x; session codes as commonly documented, confirm in your release ## Steps ### How to set up item groups **Items:** - Agree the grouping with finance and supply chain: groups usually follow how you account for and report on stock, such as raw material, purchased component, finished goods and service parts. - Open the Item Groups session (tcmcs023m000, or find it with session search for item group). - Create each group with a code and description, and set the default values the session offers for items in that group. - Set up the related accounting mapping so that transactions for items in the group post to the right ledger accounts (integration mapping in the finance setup). - Assign the group to items in the item base data session when you create or convert items. - Test with one item per group: receive, issue and invoice it, then check the postings and cost price. - Document the group list and who may add new groups. ## Sections ### What an item group controls **Body:** The item group is a lookup used in many places. In item base data it supplies defaults when you create items. In finance it is a key for mapping inventory, cost of goods and variance postings to ledger accounts. In reports and selections it is a standard way to filter or total by product family. Because it drives accounting, a wrong group causes wrong postings that are tedious to correct later. Treat it as a controlled master data field. ### Designing the group structure **Body:** Keep the list short and stable. Groups should reflect accounting and policy differences, not every product line, because product lines are better handled by other classifications. A common guideline is to add a group only when it needs different accounts or different defaults. Do not reuse a group for two meanings. If you need a distinction for reporting only, use another classification such as product line or selection codes. ### Changing a group on existing items **Body:** Moving an item to another group after it has transactions changes where future postings go and can create inconsistencies between history and new activity. Check with finance and, where the item still has stock, consider the effect on inventory valuation. For bulk changes, test the change in a copy company first and review the postings of a few sample transactions afterwards. ## Pitfalls - Creating too many groups that differ only cosmetically. - Changing the group of items with open stock without finance review. - Forgetting the accounting mapping for a new group, so postings fail or land on the wrong account. - Reusing one group for different meanings in different departments. ## Ai Angle Netray adds a private AI layer on top of the Infor LN you already run, including on-prem installs. ERPray answers questions in plain language over LN data read-only, shows the query it ran and respects LN roles, so a consultant can ask the question instead of hunting for the session. The model runs on your own GPUs, nothing leaves your network, and any write-back needs a human approval. Cloud-hosted LN works too, but the design is tuned for on-prem and air-gapped sites. For pure navigation questions, LN's own session search and help are often enough. ## Faq ### What is the difference between an item group and an item type? **Answer:** The item type describes how an item behaves, for example manufactured or purchased. The item group classifies items for defaults, accounting and reporting. They serve different purposes and are set separately. ### Where do I maintain item groups in LN? **Answer:** In the Item Groups session in common data, commonly tcmcs023m000. Use session search to confirm in your version. ### Can an item belong to more than one group? **Answer:** An item has one item group in its base data. For additional classifications use product lines, selection codes or similar fields. ### Does the group affect costing? **Answer:** It can, through defaults and the accounting mapping tied to the group. Review both when you add a group. ## Search terms infor ln item group, tcmcs023, infor ln item groups session, infor ln item base data, infor ln create item group, infor ln item master, infor ln integration mapping, baan item group --- Talk to an engineer: https://netray.co/contact?intent=erp_ai | Machine catalog: https://netray.co/agent/catalog.json