How to get the Invoice number after done Subscription billing process

Summary

How to get the invoice number after completed Subscription billing process

Content

Hi All, 

I'm testing in my Lab exercise to created new subscription and completed for below items;

• Subscription activation (Status = Active)
• Checked details information populated in Billing summary page
• Submitted 2 processes
  • Send Subscription billing information to Receivables
  • Import autoinvoice
• Checked above processes status are 'Succeeded"
• Checked column "Invoice number" in Billing summary page for same particular Subscription number, but cannot see any values shown there (as file attached)

Can you please advise, How/Where can I check, what's invoice number generated for this billing?

BR,
Adinant Hosakul