Hello Jacques,
Please, check in the Invoice form if the VAT reg. number if defined properly there.
It should be : Customer VAT Reg. Number.
If it's different, please, change it and save the form, it should be fine now.
Note: Forms register is only available through subscription (go to Marketplace), but to have this thing corrected it's enough to subscribe for one month.
Ewa Subotowicz
HansaWorld
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