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Additional OnInsertRecord is trigger when doing deep insert using API

I have 2 tables lets call TableHeader and TableLine. In TableHeader, one field had TableRelation define. When i try to do POST request with deep insert, i notice additional OnInsertRecord is trigger in TableLine. This cause additional row being insert. If i remove the table relation in TableHeader, then it work as expected. Does anyone know why tablerelation cause additional trigger to the OnInsertRecord?

table 1 "TableHeader"
{
    DataClassification = CustomerContent;

    fields
    {
        field(1; "Entry No."; Integer)
        {
            AutoIncrement = true;
        }
        field(10; "Message No."; Text)
        {
            TableRelation = "TableMessage"."Message No";
        }
}

table 2 "TableLine"
{
    DataClassification = CustomerContent;

    fields
    {
        field(1; "Entry No."; Integer)
        {
            AutoIncrement = true;
        }
        field(10; "Message No."; Text)
        {
            TableRelation = "TableMessage"."Message No";
        }
		field(11; "Description"; Text)
        {
        }
}

page 1 "Header"
{
    PageType = API;
    Extensible = false;
    APIPublisher = 'publisher';
    APIGroup = 'group';
    APIVersion = 'v1.0';

    EntityName = 'header';
    EntitySetName = 'headers';
    SourceTable = "TableHeader";

    DelayedInsert = true;
    DeleteAllowed = false;
    ModifyAllowed = false;
    ODataKeyFields = SystemId;
	
	layout
    {
        area(Content)
        {
            repeater(GroupName)
            {
                field(id; Rec.SystemId)
                {
                    Caption = 'Id';
                    Editable = false;
                }

                field("messageNumber"; Rec."Message No.")
                {
                }

                part(lines; "Line")
                {
                    EntityName = 'line';
                    EntitySetName = 'lines';
                    SubPageLink = "Message No." = field("Message No.");

                }
            }
        }
    }
}

page 2 "Line"
{
    PageType = API;
    Extensible = false;
    APIPublisher = 'publisher';
    APIGroup = 'group';
    APIVersion = 'v1.0';

    EntityName = 'line';
    EntitySetName = 'lines';
    SourceTable = "TableLine";

    DelayedInsert = true;
    DeleteAllowed = false;
    ModifyAllowed = false;
    ODataKeyFields = SystemId;
	
	layout
    {
        area(Content)
        {
            repeater(GroupName)
            {
                field(id; Rec.SystemId)
                {
                    Caption = 'Id';
                    Editable = false;
                }

                field("messageNumber"; Rec."Message No.")
                {
                }

                field("description"; Rec."Description")
                {
                }
            }
        }
    }
}

JSON 

{
    "messageNumber": "Message 1",
    "lines":   [{
                                    "Description": "Description 1"
                                },
                                {
                                    "Description": "Description 2"
                                }]
}

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