Activity type in IW32

I have an issue.

I have created 3 Maintenance Activity types-101,102,103 and assigned them to PM01, PM02, PM03 Order types.

Now If I open an order of type PM01 and click on dropdown of Maint Activity type, it is not filtering them for FT01 order type. So it is showing each activity type 3 times.

Is there any settings for this?

If I open IW31 once and click on Maintenance Activity dropdown, It is filtering perfectly.

What might be the problem.

Please help me on this.

Thanks

Ramesh Nanduri.