In customs flow the invoices show a status (Field 17) as follows

The first digit (hundred) reports
0 - Normal
1 - Hold
2 - Deleted

The second digit (ten) reports
0 - Not printed
1 - Printed

The final digit (one) reports
0 - Not confirmed
1 - Confirmed

Numbers not listed above don't exist (there is no status 300 for example)