Change ownership of migrated content from SunOne to other authentication source

[Ucat]

Dear Sirs,

We have migrated the PowerPlay 7.4 user contents (newsindex, folders and reports ) to Cognos8 BI using as authentication source the SunOne Ldap provided with the PowerPlay 7.4 version. 

Now we have as a requirement from management to use the already present corporate Ldap as the authentication source for cognos8 BI (management doesn't want two authentication sources).

We have already configured the corporate Ldap as an authentication source in Cognos 8 BI but, we need to change the ownership of all the migrated data. So we request your help with the following question:

How can we change the ownership of all the migrated data to the equivalent users in the corporate Ldap ?

Please, we have a large number of objects to modify so we ask for your advice on how to complete this task.

Thanks in advance,