Will GOP consume a stock from onhand or incoming supply when incoming Transfer order is available?

Business Scenario:

Onhand available : 2 qty only. Incoming supply from Transfer order on date 19th April -100 qty

Create sales order1 on today with request date as 20th April (within ATP fence) with qty as 2

Create Sales order2 on tomorrow, with request date as tomorrow with qty as 2

Based on above data, my understaning is Sales order 1 should get SSD/SAD based on Transfer order supply which is available on 19th April and should not consider onhand for promising. Sales order2 should get SSD/SAD based on onhand.

What i am saying here is GOP should always keep onhand for orders which might get created later but with earlier request dates and try to consume from incoming supply if there is incoming supply available.