Sap (movement type) is designed as no withdrawal (transfer posting) are possible from blocked stock (except for sample or scrap).
So 1st I would review the process and try to understand why is this kind of transfer s to happen.
But here is another track to follow...
In the Po document transfer from plt to plt or even Sl to sl there is in the delivery tab the option to enter the stock type. Same option seems to be available in delivery.
This should be investigated!
I think that you will find that 325 is ONLY for storage location to storage location within the SAME plant.
SAP processes do not allow the transfer of Blocked stock between Plants, you need to move it to unrestricted and then transfer it and then receive it into blocked stock.