While releasing billing block in workflow process, new price is updating for Return orders

[krajireddy]

Hi Experts,

   We are creating Return orders with reference to Billing document, and as per process return order will go to Billing Block.

     In workflow billing block is removing , but after removing billing block new price is updating instead of Billing document net price.

    So how to avoid updating new price.

Thanks and Regards,

Raji Reddy