GL entries with a value in Additional Currency, but zero in Amount field

Hello,

In NAV 2009 R2, we have come across a situation where in for some Sales Invoice documents, there are G/L entries posted with a value in additional currency amount, but the Amount is zero.

For example,
G/L Account Additional Currency Amount Amount

---

32010 (Inventory Account) 100 0
73373 (Sales Account) -100 0


Not sure if these entries are generated because of Adjust Item Cost or Cost Post to G/L functionality.

Is this a bug in NAV 2009 R2 version?


Thanks in advance.