Printing Dunning Letter at Customer Aging

My client is using SAP B1 2005 SP1 Patch 42.

Dunning term and dunning level has been properly set up.

We have also design the dunning letter for dunning level 1, eg called it DunningLetter#1

When using Dunning Wizard, SAP prints the letter for dunning letter for dunning level 1 with no problem. However it does not allow preview on the screen.,

Therefore, we try to running Customer Ageing by Due date so that we can see the dunning level, if needed change it. However, when try to print preview dunning letter, it shows nothing on the screen. However, it can be printed directly to the printer.

Is this how it is supposed to work? Ie, we cannot print preview dunning letter.