What are Vtiger CRM Workflows for Purchase Returns?

Once you create a Purchase Return, CRM workflows update the product's stock in the Products module. It auto-updates the count of products returned back to vendors for every Purchase Return. 

Enabling UpdateInventoryProducts On Every Save workflow for the Receipt Notes module auto-updates Products stock for every Purchase Return.
Follow these steps to enable the UpdateInventoryProducts On Every Save workflow for the Receipt Notes module:

1. Log in to your CRM account.
2. Click the User Profile.
3. Click Settings on the bottom left corner of the screen.
4. Look for Automation.
5. Select Workflows.
6. Select Receipt Notes from the (module) filters dropdown.
7. Enable UpdateInventoryProducts On Every Save workflow.

Once you enable it successfully, product stock updations are automated in the Products module.