Item Ordering Data should have Order System as Planned and if use Order Interval it should be populated. If Purchase should have Supply Time in Item Purchase Data. If Manufacter should have Order Lead Time in Item Production Data. Item Planning Data you need to determine if you are using Order Based/Master Based Planning, Time Fences and Order Horizion and if Master Based Planning Horizon and other information on the Master Plan Tab. You may also need to check the Item Supplier Information to see if it's populated correctly and that the Lead Times are Calculated there. Buyer/planner code should be populated in Item Purchase, Item supplier and Item Planning Data.
In session cpra01110m000 Signal types by Planner we use the blankd planner code as the default. Here you can change some of the setting on you signals.
This should be the only fields required to generated signals when you update the scenario and asked for update signals by Item/Planner.
If you have a specific question send me a private message and I will get back with you.
Tommy L. Bacon, CPIM