Posting purchase invoice and vendor pay journal - ledge transactions question? AX 2012 R3

We use non-stocked items. Since no inventory - I wonder how the purchase work from ledger transactions perspective. What other transactions would be registered in the below scenario.  Your help much appreciated. 

We buy an item from a vendor and sell it to a customer:  No stocking; net 30 for vendor; net 30 for customer; 

I post purchase invoice: what happens? 

Vendor balance a/c Cr             purchase expense a/c Dr 

AP Payment journal posting (I cut a check) 

Vendor balance a/c Dr            Cash a/c  Cr  

Want to make sure we are covering all the accounts: 

already have set up purchase expenditure for expense, Purchase expenditure un-invoiced etc.,  In R2, there were bunch of transactions, but i believe in R3, it has changed.