# Prevent Duplicate SKU's or Order Numbers **URL:** https://community.glideapps.com/t/prevent-duplicate-skus-or-order-numbers/67070 **Category:** Ask for Help **Created:** [October 17, 2023, 8:28pm UTC](https://community.glideapps.com/t/prevent-duplicate-skus-or-order-numbers/67070 "2023-10-17T20:28:35Z") **Posts on this page:** 1 **Showing post:** 2
### Author: ![nathanaelb](https://sea2.discourse-cdn.com/flex002/user_avatar/community.glideapps.com/nathanaelb/32/43079_2.png) [@nathanaelb](https://community.glideapps.com/u/nathanaelb) #### Post date: [October 17, 2023, 10:09pm UTC](https://community.glideapps.com/t/prevent-duplicate-skus-or-order-numbers/67070/2 "2023-10-17T22:09:09Z")
> [@How do I create a custom form?](https://community.glideapps.com/t/how-do-i-create-a-custom-form/25014): > > I’m just dropping this here so I have something to refer people to when they ask. This is a simple concept app (copyable), that demonstrates the following techniques: Building custom forms for adding and editing list items (as an alternative to the native forms provided by Glide) Preventing duplicate new entries using [User Specific Columns](https://docs.glideapps.com/all/reference/data-editor/user-specific-columns) and [Relations](https://docs.glideapps.com/all/reference/data-editor/computed-columns/relation-column) Enforcing mandatory input items The use of visibility conditions and user specific booleans to control user flow There is nothing particula… --- _[View the full topic](https://community.glideapps.com/t/prevent-duplicate-skus-or-order-numbers/67070)._