--- title: Material must be Unique within Group description: "When adding timber parts to your Part List, you may encounter this error message: "Material [material name] is already specified on part [part number and name] for the [group name] group in this cate" --- [Skip to content](https://knowledgehub.endtoendit.com/knowledgebase/material-must-be-unique-within-group#main-content) [![integrate knowledge base](https://knowledgehub.endtoendit.com/hs-fs/hubfs/integrate%20knowledge%20base.jpg?width=386&height=34&name=integrate%20knowledge%20base.jpg)](https://knowledgehub.endtoendit.com/knowledgebase?hsLang=en) Open main navigation Close main navigation - [endtoendit.com](https://endtoendit.com/) [endtoendit.com](https://endtoendit.com/) Hello. How can we help you? - There are no suggestions because the search field is empty. 1. [integrate Support Team Knowledge Base](https://knowledgehub.endtoendit.com/knowledgebase?hsLang=en) 2. 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Why this error message appears** This error message appears if there is already a **part** of this **material** in the **group** which has been selected. Group is the subcategory selected next to category. For example, the category is **surround \> internal architrave** and the group is **3 inch Ogee:** ![](https://knowledgehub.endtoendit.com/hs-fs/hubfs/image-png-Jan-14-2025-02-14-08-5697-PM.png?width=566&height=40&name=image-png-Jan-14-2025-02-14-08-5697-PM.png) **3. The solution** For **material must be unique within the group** select one of the following options: Select a **different material** for the part Select a **different group** Create a **new group** from the dropdown menu ![](https://knowledgehub.endtoendit.com/hs-fs/hubfs/image-png-Jan-14-2025-02-15-45-2675-PM.png?width=147&height=88&name=image-png-Jan-14-2025-02-15-45-2675-PM.png) - [integrateCRM Module](https://knowledgehub.endtoendit.com/knowledgebase/integratecrm-module?hsLang=en#main-content) - [Leads & Prospects](https://knowledgehub.endtoendit.com/knowledgebase/integratecrm-module?hsLang=en#leads-prospects) - [Emails & Templates](https://knowledgehub.endtoendit.com/knowledgebase/integratecrm-module?hsLang=en#emails-templates) - [Tasks, Appointments & Reminders](https://knowledgehub.endtoendit.com/knowledgebase/integratecrm-module?hsLang=en#tasks-appointments-reminders) - [Quotes & Orders](https://knowledgehub.endtoendit.com/knowledgebase/integratecrm-module?hsLang=en#quotes-orders) - 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