Actual activity drives its succcessor

Dear Friends

I come across with a problem resulting from driving activities.

The activities that have actual start and finish dates drice their successor activities since their predecessors are not actual.

Let me explain wit a simple example

C200 Construction / P200 Procurement Phase-2 / P100 Procurement Phase-1

P200 drives its successor C200 altough P200 has actual start and finish dates. However P200’s predecessor P100 is not actual.

Your advice regarding the issue will be highly appreciated.

Thanks

Osman