In the Physical Stock Entry module, the system currently allows duplicate data entries for the same inventory item. There is no validation to prevent entering identical records multiple times.

This results in duplicate records being created in inventory, which in turn causes confusion and inaccuracies in the Stock Adjustment section.

Steps to Reproduce:

1. Login to Inventory link, under Main Store.
2. Navigate to Physical Stock Entry.
3. Enter stock details for an item and save.
4. Enter the same item details again with identical parameters.
5. System allows saving duplicate entry.

Expected Result:
The system should restrict duplicate stock entries by applying validation (based on item, batch, location, or relevant identifiers).

Actual Result:
Duplicate stock entries are allowed without any validation.