Transportation Resource with SNP Optimizer

Hello experts,

I found this explanation on SAP help.

Transportation Resources - FROM SAP HELP

Available Capacity

1. You can assign transportation resources to multiple transportation lanes and so limit the transportation capacity on these transportation lanes. To do this, specify a transportation resource in the Resource field of the Means of Transport section in the transportation lane.
2. In the SNP optimizer profile, you can set that you want the available means of transport to be treated as discrete (in non-divisible integer numbers). If you do this, the means of transport is treated as discrete for each transportation lane. You define the capacity of the means of transport in the Transp.Res.Size field of the resource master data.

  You can use this option to model the means of transport that are available in your company (a truck, for example). However, if you commission external transportation service providers, considering means of transport as discrete is not relevant for you. 

With the first point I'm OK. For the second point I would like to have your input (opinion) about this:

• You define the capacity of the means of transport in the Transp.Res.Size field of the resource master data. You can use this option to model the means of transport that are available in your company (a truck, for example).

Second opinion - are the two points complementary?

Thank you,

Regards, Marius