In the movement type config - there is an auto PO creation flag, which allows the system to automatically create PO in the background from within the GR posting transaction. Has anyone used this feature -please share your experience. We are on 46c, and I don't see any existing movement type in the system which has this flag turned on.

For business process control purpose, I suggest avoiding auto PO from GR unless it is really necessary. Instead, use "traditional" PR-PO-GR process.
 

Actually what is the rational of using a automatic PO function, what is the benefit and what is the disadvantages of using this function? and under what business practise is best suit to use this function?

Sometimes the SAP help portal give you a lot of technical but didn't explain thoroughly from the business perspective point of view.
 

One of the benefits of using this feature is that you are taking delivery of the raw materials which are delivered by trucks and since it is not possible to capture the actual receipted quantity at the time of PO creation. Other benefits is to reduce the workload of purchasing department for the case of consignment process.
 

How to create AUTO PO during MIGO ?

Check in customizing whether you have maintained creation of automatic PO during good receipt.
Menu path : MM -> Inventory Management -> Goods Receipt -> Create Purchase order Automatically -> Activate Auto PO creation for Mvt type.

And then activate Auto PO creation in vendor master.

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