Managing Legacy and SAP Supplier IDs During S4HC Data Migration

In the information migration to S4HC, we person opted for SAP to make caller IDs for each bequest supplier ID.

For different migration files, specified arsenic PIRs and POs, wherever determination is simply a "Supplier" field, should we usage the caller SAP IDs oregon the bequest IDs to migrate them ? If we request to usage the SAP IDs, this volition impact further manual enactment for us. Alternatively, if we usage the bequest IDs, volition SAP admit and representation them automatically to the caller SAP IDs generated ?

Thank you for your assistance with this matter.