Questions Bulk update Customers' Mailling recipients

Hi Guys, I am new to Acumatica.

I need update recipients in customers' mailing settings. the result I need: add 2-5 contacts under Mailling ID:So Invoice.

There is my import scenarios

MY data provider has 4 columns customer ID, Mailling ID, Contact Type, Contact ID.

sample data and error like this:

I use GI to checked database, I have the contact ID 8614 in customer contact table. 

I muanlly add 1 line then checked the database:

Table[NotificationSource],there is column''Mailing ID":d2b82e05-d14d-47ac-8e24-6452626b087f

Table [NotificationRecipient], there is column "NotificationRecipient-SetupID" :d2b82e05-d14d-47ac-8e24-6452626b087f

so I think in database mailing ID :SO INVOICE is d2b82e05-d14d-47ac-8e24-6452626b087f ?

but I still got errors when I try to import. I am very confuse where is the problem. in import secnario or my sample data?

Thanks