Data Class - Upgrade

Hello Experts,
I'm working for an Upgrade Project!.
Some how by other Developers data class has been changed for SAP standard Data Classes DDIM and DFACT to ZDIM and ZFACT as a part of the upgrade.  I can see few tables are with the standard ones and few are assigned with the changed data classes.
I dont know why this has not been taken care for all the objects.!!
Can any one guide me.. where we can revert these changes using the program RSDG_DTLCLS_ASSIGN back to DDIM and DFACT for the changed tables. If so what will be the consequences on the same?
This activity has not been carried in the Integration system.!! We dont have the Custom Data classes earlier in the system..
Can any one guide me on the same?
Thanks
Raman....

Hi Sharad,
This step is required only for User defined data classes (Z classes) which you can find in table DDART.
Else you can ignore this step.
Regards,
Agrima

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