BTP side-by-side extension - Annotation

[sameerdesai]

Hello,

I'm new to BTP environment &  have started to learn BTP side-by-side extension via C_CPE_14 learning journey. I have a question reg. annotation for value help in Risks entity. below is snippet of code. 

if you see, in one place it's used "miti.descr" while in other place it's used "miti_ID".

Can you help me understand difference & when to use correct annotation?

Thank you.

Risk Entity Annotation

annotate rm.Risks with {

    miti

       @(Common: {

        //show text, not id for mitigation in the context of risks

        Text           : miti.descr,

        TextArrangement: #TextOnly,

        ValueList      : {

            Label         : 'Mitigations',

            CollectionPath: 'Mitigations',

            Parameters    : [

                {

                    $Type            : 'Common.ValueListParameterInOut',

                    LocalDataProperty: miti_ID,

                    ValueListProperty: 'ID'

                },

                {

                    $Type            : 'Common.ValueListParameterDisplayOnly',

                    ValueListProperty: 'descr'

                }

            ]

        }

    });

}

DB Schema

entity Risks : managed {

    key ID          : UUID @(Core.Computed: true);

        title       : String(100);

        owner       : String;

        prio        : String(5);

        descr       : String;

        miti        : Association to Mitigations;

        impact      : Integer;

        bp          : Association to BusinessPartners;

        // You will need this definition in a later step

        criticality : Integer;

}

entity Mitigations : managed {

    key ID       : UUID @(Core.Computed: true);

        descr    : String;

        owner    : String;

        timeline : String;

        risks    : Association to many Risks

                       on risks.miti = $self;

}