Foreign Exchange Revaluation- Bal in LC stands

Dear Experts;

For my client, below steps they have performed;

1. Opened the bank account (in EUR). Three bank GL; One main, One Outgoing and one Incoming. All in EUR
2. Post AR
3. Post Incoming Payment.
4. Realized Exchange Difference Posted, which is posted to an expense (PL) GL.
5. BRS Entry posted via F-04
6. System reverses the already posted 'Realized Forex' and posts the full Exchange Rate difference to 'Realized Forex' GL again.
7. Month End- FAGL_FC_VAL run but no values posted, as there was no open item and no closing balance in Bank Main
8. Create AP
9. Payment to Vendor
10. Realized Exchange Difference Posted, same GL as in Step 4.
11. BRS Entry posted via F-04
12. System reverses the already posted 'Realized Forex' and posts the full Exchange Rate difference to 'Realized Forex' GL again.
13. Month End- FAGL_FC_VAL run,
14. Exchange difference is posted to Unrealized Forex (PL) and Provision Gl (Balance Sheet Adj Ac)
15. 1st of next month, reversal of Step 14 is posted.
16. Balance in Main Bank is payed out to close the bank account. For this, expense JV posted where Exp (Debit) and Bank (Outgoing) - Credited
17. BRS Entry posted via F-04
18. Realized Exchange Difference Posted to same GL as in Step 4.

Now my question is, when bank account is closed in EUR, system still shows some value remaining in my Local Currency. This is not correct. Ideally, when a bank account is closed, it should show zero value in all currencies.

Please suggest, which step is missed (if any) or am I missing any configuration. For your understanding, in OB59, I am using the option "Exch. Rate Type from Invoice Reference'

Please suggest.

Thanks

Syed Zia Abbas