1- ASN will be optional to suppliers - You can define in the transaction rules "Order Confirmtion and Ship Notice Rules" if you want this to optional, activated or deactivated. Kindly check 5.3.1.3.2 Defin Order ConfiUmDtLon and Ship Notice Rules in the below link.
2 - GR can be created with reference to PO or inbound in S4hana - Yes this is possible. There are few restrictions for now for inbound delivery such as scenarios of batch management (for outbound and inbound delivery) and serial numbers (for
advance ship notice) aren't supported. Kindly refer to the same above link.
3 - Once GR is received in supplier network , supplier should post invoice - After GR confirmation in AN Supplier can post invoice. But that also depends on the transactions rule as pr customer requirement.
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