> 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/inventory/assembling/assembling-configuration/lot-number-as.md).
# Lot Number As
**YouTube:** [How to Configure Automatic Lot Number Generation in Assembling?](https://www.youtube.com/watch?v=-MOJpB6F3Hs)
## How to Configure Automatic Lot Number Generation in Assembling?
In this tutorial, we will learn how to configure the **Lot Number As** option in the Assembling Module of Logic ERP. This feature allows you to control how Lot Numbers are generated during Assembly transactions by choosing between automatic generation, manual entry, or a custom expression.
***
### Objective of This Feature
* Configure flexible Lot Number generation.
* Support automatic or manual Lot Number assignment.
* Generate customized Lot Numbers using expressions.
* Improve product traceability and inventory management.
* Standardize Lot Number formats across assembly transactions.
***
### Access to Assembling Configuration
* Go to the **Assembling Module**.
* Open the **Configuration** window.
* Locate the option labeled as:
> **"Lot Number As"**
This option provides three parameters:
* **Lot Number**
* **Manual**
* **Expression**
Let's understand each option one by one.
***
### Option 1: Lot Number (Default)
**Configuration**
* Select **Lot Number** in **Lot No As**.
**Observe the Functionality**
* Create a **New Assembly** entry.
* Select the Finished Item.
* Enter the required details.
**Observation**
* Before saving the document, the **Lot Number** field remains blank.
* Now, save the Assembly document.
* Open the same document again using **Modify Issue**.
**Result**
The system automatically generates a Lot Number after the document is saved.
***
### Option 2: Manual
**Configuration**
* Return to the Configuration window.
* Select **Manual**.
**Observe the Functionality**
* Create a new Assembly entry.
* Select the Finished Item.
* Enter the required details.
**Observation**
* The **Lot Number** field becomes editable.
* Enter the desired Lot Number manually.
* After verifying the details, save the document.
**Result**
The manually entered Lot Number is saved and assigned to the Assembly document.
***
### Option 3: Expression
**Configuration**
* Return to the Configuration window.
* Select **Expression**.
* Click **Lot Expression** to open the Expression Builder.
#### **Define the Expression**
* Create the required Lot Number expression using the available fields.
* For example: **Issue Date-01**
* Save the expression and the configuration.
**Observe the Functionality**
* Create a new Assembly document.
* Select the Finished Item.
* Complete the required details.
**Observation**
* Before saving, the **Lot Number** field remains blank.
* Now save the document.
* Reopen the saved document using **Modify Issue**.
**Result**
The system automatically generates the Lot Number according to the configured expression.
**For example:**
* **Issue Date:** 30-Jul-2026
* **Generated Lot Number:** 30072026-01
The Lot Number is created exactly as defined in the configured Lot Expression.
***
### Key Benefits
* Supports automatic and manual Lot Number generation.
* Allows customized Lot Number formats using expressions.
* Improves inventory traceability.
* Ensures consistent Lot Numbering across assembly transactions.
* Reduces manual effort and data entry errors.
***
### Best Practice Tips
* Use **Lot Number** for automatic system-generated numbering.
* Use **Manual** when Lot Numbers are assigned externally.
* Use **Expression** to create standardized Lot Numbers based on business rules.
* Design expressions that include meaningful fields such as dates, document numbers, or item information for better traceability.
***
### Final Outcome
The **Lot Number As** feature in the Assembling Module provides flexible Lot Number generation based on your business requirements. Whether you choose **automatic generation**, **manual entry**, or a **custom expression**, Logic ERP ensures accurate, consistent, and traceable Lot Number management for Assembly transactions.
---
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