Hi jan pat,

Thanks for reaching out. Did you ever find an answer to your question? See KB 34837 on how to input and pay back a bank loan / mortgage in Sage 50 CA. It reads:

Input a bank loan

1. Open General Journal window.
2. Debit bank account and credit bank loan liability account.
3. Click Post.

Hope this helps!

Warm Regards, 
Erzsi