Why am I unable to move a fulfillment order to a new location?

[24sevencommerce]

 I am trying to move a fulfillment order to a new location using the following endpoint:

 admin/api/2020-10/fulfillment_orders/3048294678686/move.json

Body :   

{

        "fulfillment_order": {

                "new_location_id": 56287264926

       }

}

but it is giving me error:

StatusCode: 422, ReasonPhrase: 'Unprocessable Entity', {"errors":["Cannot change location."]}

Why am I getting this error?