Finance Charge implementation

Hi,

I'm trying to implement finance charges and I've setup the following

AR: Enable Debug Message Output:Yes

AR: Use Statement Site & Dunning Site Profiles:No

Recievable Activity: Finance Charge

 Setup->System->System options->Define the finance charge activity

Setup->System->System Options-> Check Accrue Interest

 Define Customer Profile class:

 with charge interest rate of 2 and the statement cycle as monthly.

I've also checked the finance charges field.

After running the statement for a customer with past due invoices I get a statement,but I thought checking ACCRUE INTEREST FLAG on system options was supposed to add an adjustment line to the past due invoices  with a finance charge.