Physical name of Planner Master table

I need to add a field to the Report: Buyer Id for Default Site.

The user of the GP showed me that it is a Buyer ID field on the Item Resource Planning Maintenance screen.

I used a method to find a table: Open the Microsoft Dynamics GP window that contains the data you are interested in, and then select Tools >> Integrate >> Table Import to see the tables associated with the Dexterity Form.

This is Microsoft Dynamics GP 2016.

For the form Item Resource Planning Maintenance 5 tables appeared:

I was able to find that Buyer Master table has Physical Name POP00101.

P2.

I checked this table and found that it is just a dimension table for Buyer ID.

I tried to find a Physical name of Planner Master table, but it was not in the list.

So, I have 4 questions:

1. What is the Physical name of Planner Master table?

2. Why it is not in the list on Table Names Screen?

3. Why I should look through dozens on Series and cannot just select ALL to find the table?

4. Where I can find the whole list of the tables for Microsoft Dynamics GP 2016?