Pit-Fall of Implemenating ERP Cloud on an existing HCM Cloud

Content

Good People,

Requesting feedback on :

1. Currently business is using HCM Cloud with Payroll which is integrated with 3rd Party ERP Application.

2. Business has some COA already defined for shared Payroll .

Question :

1. Is this mandatory to use the same existing COA or a new COA can be defined ?

2. If a new COA can be defined does it require implementation of payroll afresh ?

3. What are the critical points to check before ERP Implementation in such scenario ?

Any help is highly appreciated.

Thanks,

Soumya