How to identify the material's status within GR blocked stock

Hi Experts:

We have the goods receive for purchase order process is that all the goods from supplier reference to PO should be move to GR blocked stock first(103), and release to un-restricted stock after goods quality inspection(105).

Those quality is not accepted goods should be remained in the GR blocked stock for a long time and some of them will be returned to supplier and some of them will be finial accecpted to un-resticted stock after repair. My question is how can we seperate the material's status from normal goods receive within the GR blocked stock becasue our client want to analysis the GR blocked stock. or if possible those quantites can be move to our no-valued stock? or we can active the vendor batch to seperate? Would you please give me some advice on that?

thanks and best regards

Xincheng