Hi ruining,
Well, sorry in the code I sent you just delete the line
vCustomers.MARKEDONLY(true);
And it will work. I've just tried it and it is working with two same Customer Names with different Customer No.
The GETRECORD function gets the record selected in the Customer List Page and assign it to the vSelectedCustomers. So the vSelectedCustomers will have only the selected record from the page.
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Don't hesitate if you have more question or more details/explanation.
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Best Regards,