Item samplings allows you to create a Quality order for each recorded receipt/registration and for each batch being received. If you turn off the 'Per updated quantity' option you only get Quality order(s) for the first receipt and the Batches being received at that time.

What if you want to have a Quality order for the first time a Batch is received?
It seems unlikely that anyone using Batch tracking would only test the batches received on the first receipt so you should be able to turn off the 'Per updated quantity' option and only get a Quality order for any new Batches received, if that option is selected, no matter how many receipts are made for that PO line.