Service Contract Credit memo - NAV 2018

Hi All,

I need your help regarding Service Credit Memo.

I created service contract whose Line Value is 6570, it is for 12 months and it is Yearly.

Created its invoice

system created 12 lines in invoice with Line Amt 547.50

When I create Service Contract Credit Memo from Service Contrat card then it create credit memo with amount 17.66

Now I am not getting, system even didn't ask me for any period while creating credit memo and it directly create credit memo of 17.66. This 17.66 is one day's amount(something round off).

Can some help me how to make service credit memo? I am doing its first time.

Thanks in advance.