# About PIH on 2 register device **URL:** https://zatca1.discourse.group/t/about-pih-on-2-register-device/1664 **Category:** General **Created:** [May 23, 2024, 2:41pm UTC](https://zatca1.discourse.group/t/about-pih-on-2-register-device/1664 "2024-05-23T14:41:33Z") **Posts on this page:** 1 **Showing post:** 9
### Author: ![lalomar](https://avatars.discourse-cdn.com/v4/letter/l/5e9695/32.png) [@lalomar](https://zatca1.discourse.group/u/lalomar) #### Post date: [May 29, 2024, 6:57am UTC](https://zatca1.discourse.group/t/about-pih-on-2-register-device/1664/9 "2024-05-29T06:57:57Z")
Hi @DS2022 , Kindly note that the sequence should follow the generation order not submission order. Moreover, there are no limitations on uploading/sending simplified invoices to ZATCA, it can be uploaded to any order as long as they are generated on a sequence, and the sequence will be validated on the backend, so it’s not a (real-time validation). Ex: if invoice 1, 2, 3 were generated in a sequence, it can be submitted as invoice 2,1,3. So there is no need to do an extra step to modify your PIH if your EGS generating your invoices in a sequence, however, any identified gaps on the sequence compliance during backend validation, will be submitted to further investigation by ZATCA and may result in penalties if found to be non-compliant. --- _[View the full topic](https://zatca1.discourse.group/t/about-pih-on-2-register-device/1664)._