Hi Kalim,
I believe you can even assign both the posting keys (40-Debit for main bank account and 50-Credit for Amount Received account) and use the posting type as 1 which is 'Post to G/L account'. But in this case system would not automatically clear the open items.
System would just do the posting and even we can have intermediary account which needs to be cleared manually if we use the above config.
so like for outgoing payments postings would be like
From EBS:
Credit: Main bank GL account
Debit: outgoing payment account (clearing account)
From Payment (F110)
Debit: vendor account
Credit: Outgoing payment account
Then this outgoing payment account can be manually cleared. But if we use posting type as 4 system would try to clear this account automtically.
Hope this helps.
Thanks,
Gaurav