Availability Check Group Vs Checking Rule

Hi Team,

I have maintained availability check related configuration as below.

OVZ2: (I have set total sales & total deliveries as "B-Total records per day")

OVZ9: (Scope of Check, NOT selected the "Sales Requirements" & "Sales Deliveries" )

Note: In the respective material master, i have maintained the availability check as "01" in MRP view.

Q1: Since in the "OVZ9-Scope of check", i have NOT set the sales relevant movements (ie, sales requirements & Include Deliveries), will the value "B" in OVZ2, will have any meaning?

Q2:Suppose if i set the sales relevant movements (ie, sales requirements & Include Deliveries) check box in OVZ9 & if i enable the check box "No Check" in OVZ2 for the checking group "01", will the ATP check will be performed? I think the ATP check will NOT be performed. Is this correct?

Thanks