Hi Nash,
You could also use SAP JCo Interface action block.
If you use this action block then you do not need to use SAP JCo Start Session action block as all the ECC system settings need to be given in this SAP JCo Interface action block only.
Also depends on your business scenario.
If you need a session to be maintained(in case where add, edit or delete type of operations are performed) or you make more than 1 calls to ECC and want all of them to happen or fail then using SAP JCo Start Session, SAP JCo Function, SAP JCo Commit is more beneficial.
But if you dont need a seesion then SAP JCo Interface action block could be used.
Regards,
Rohit Negi.