Reserved stock of sales order not able do PGI.

Dear SD Experts,

I have checked number of threads in google but not able to find, so please share your knowledge.

I have saved the stock for one sales order by using Movment type 412 E in MB1B T.code

But while doing PGI getting below error.

Message No ::

Deficit of BA Unrestricted-use 620 TO 

Message no. M7021

But stock is there for sales order.

Screen 1--CO09

Screen -2  MD04

Screen -3 --MMBE

Screen-4 MB5B

Thanks in advance.