Difference between GR Blocked stock and Blocked stock ?

GR Blocked stock - Conditional acceptance of material e.g. vendor supply excess material earlier to delivery date or material damaged in transport and you wanted to take decision after some time. Whenever you are not sure about the quality of the product received, you can put in GR blocked stock.  It is only recorded in the purchase order history. This stock is NOT valuated until actual receipt 103 is GR Blocking , then 105 is Releasing GR Blocked to Quality or Unrestricted stock .

Blocked stock - Material rejected by quality or in production.