Can we adjust supplier invoice costs in projects if supplier cost clearing account not defined

We are on Oracle EBS R12.2.10

Few doubts to understand how Accounts Payables/Supplier Costs and Oracle Project Costing is integrated. Please clarify.

When we create a supplier invoice in AP with Project, Task, Expenditure Item details the distribution charge account get picked up from the account generator workflow setup. And, when we complete the process PRC - Interface Supplier Cost to Project, in Project module we get to see the accounted cost transaction under the expenditure inquiry window. Please correct my understanding here.

Now if we adjust/transfer cost from one project/task to another in Project Costing for transaction source "Oracle payables supplier invoice", that time if we do not have the auto accounting rule defined for supplier cost clearing account, then this cost adjustment transaction would fail. Please correct my understanding here also.