[A] In order to check the details of blocked quantity in MRP report, select the "Blocked IN" column from select column option as shown below. 

[B] As you can see after selecting the above column "Blocked IN" will appear in the report, in which you will get to know how much quantity is blocked in which process

[C] In the same way you can check for Required Quantity, Total Ordered & Total Inward(QIR pending) details by selecting Required IN, Pending PO & QIR Pending IN respectively.

Keywords: Blocked Quantity, Required Quantity Details