> For the complete documentation index, see [llms.txt](https://kb.logicerp.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://kb.logicerp.com/logic-erp-learning-hub-tutorials-and-best-practices/setups/configurations/purchase-voucher-configurations/other-settings-1/validate-purchase-bill-amount-against-gate-pass-entry.md).
# Validate Purchase Bill Amount against Gate Pass Entry
YouTube: [How to validate Bill Amount in Purchase against Gate Pass Entry?](https://www.youtube.com/watch?v=2nWLdsOEYsQ)
## How to validate Bill Amount in Purchase against Gate Pass Entry?
In this Tutorial, we will explore a validation feature that ensures the purchase amount or bill number aligns with the Gate Pass Number (GPN).
### **Enabling Validation Option:**
* Navigate to the "**Purchase Challan Configuration"**.
* Locate the option and enable "Validate Purchase Bill Amount against Gate Pass Entry"
### **Gate Pass Manager Configuration:**
* Navigate to the Inventory > Gate Pass Manager and the Click on Configuration.
* After configuring, enter the gate pass entry.
* Ensure that your entry has been saved. For example, we have entered an amount of 25,000.
### **Validating During Purchase Challan:**
* Create a **New Purchase Challan**.
* Enter details: **Challan Number, Date, GPN Number, and GPN Date**.
* Attempt to **save the challan**:
* If the **Challan Amount** does not match the **GPN Entry**, a validation message appears.
* The software **prevents saving** the voucher until the amounts match.
**Finalizing the Entry**
* Adjust the **Challan Amount** to match the **GPN Entry**.
* Save the **Challan** again.
* The software **validates the Bill Number** against the GPN Entry.
* After corrections, the software **allows the entry to be saved**.
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