Policy script for New computer accounts

Question

We have been running a policy script to create new users for ever :). 
 The business wants to create random computer names for pre-created computer objects, easy enough in in PowerShell with a uniqueness check. 
 However using a onprecreate event handler, we get a system violation stating the property is owned by system when we attempt to set the CN. "encountered an error when creating the object 'cn=L538784,OU=Laptop,OU=Quest Test Objects,DC=corp,DC=test,DC=com'. The attribute cannot be modified because it is owned by the system. (Exception from HRESULT: 0x800720B1)" 
 Ideally I would like the policy would pre populate the computer name when the agent selects new computer of selected OU's. 
 the original user object script had a policy marker, function onGetPolicyMarker=EDS_APE_TYPE_UNIQUE_NAME 
 Is there an equivalent for PowerShell and computer objects ? 
 Thanks,

Sargay K · Answer

>>>(Exception from HRESULT: 0x800720B1) Could you please show your policy script? 
 
 >>Ideally I would like the policy would pre populate the computer name when the agent selects new computer of selected OU's. 
 I would implement a policy script with onGetEffectivePolicyInfo() handler that gererates a unique value for computer name and then sets it as the attrbute value via EDS_EPI_UI_GENERATED_VALUE