After turning on the Price list security, previous price lists are not visible and neither editable

Hi,

I followed the steps to enable price list security as below :

1) Assigned maintain access at global level to a entity set which contained all the existing price lists

2) changed the profile options as below :

QP: Security Default Maintain Privilege : User

QP: Security Default ViewOnly Privilege : Global

  Ran the price security concurrent program to turn on the QP: Security Control profile option.

The security setup is working fine for the new price lists but previous price lists are not visible nor editable.

Please advise.