Hi,
Isn't your first entry an accrual entry? You can actually have this posting via TPM44 and then FWZE to post actual interest received. But Automatic debit position is used for posting of items coming from Securities Account Management or these are actually the condition flows you've entered in FWZZ (Class master data) like FInal repayment or coupon payment. Manual debit position are those other flows like charges related to coupon payment which you have not entered in condiitons tab in FWZZ.
Regards,
Chaikaru