Credit Memo not balance after try applied to invoice

Hi All,
I have a problem with Credit Memo.
Credit Memo have line only without tax. After trying applied to invoice, balance due become not balance and appear tax balance due. So Credit Memo become not balance.

CM Before Apply to Invoice :
Line = (55,200)
Balance Due = (55,200)

CM After Apply to Invoice :
Line = (55,200)
Tax = (55,200)
Balance Due = (110,400)


Please help, because our user couldn't closing prior period due to this issue.

Many Thanks.

Regards,
Herlan.