REST/SOAP Webservice for getting PO Receiving Quantity

Summary

Looking for REST Webservice which would return the remaining Receiving Quantity for a Purchase Order.

Content

Hello All,

Is there any webservice(SOAP/REST) which would give the Remaining quantity to Receive on a Purchase Order? I have looked into Release 13 18A/18B procurement/SCM services and did not find any.

To elaborate, lets say I have a PO Number 10 with a quantity of 300, there is webservice out there to get this PO Line quantity.

But, if I receive around quantity of 100, is there a webservice which would give ME the remaining quantity that needs to be received is 200?