The flag for Check box 'Confirmation-Related Invoice Verification ' not set

Hello,

When i try to create a limit PO , under 'Follow-on documents' at header level , the flag for 'Confirmation-Related Invoice Verification ' is not set.

This leads to the status : Transfer Failed (E.Sys.)

As soon as i flag the check box 'Confirmation-Related Invoice Verification ' the PO is created correctly and transfered to the backend without error.

Could you please tell me how can i default this flag.

Regards,

Lina