This message originates from Exact Online Bouw (formerly Bouw7). The cause is that the delivery ticket (commitment), which is linked to the booking in Exact Online Bouw, has the status processed 'Yes'.
Cause: commitment in the booking
Open the booking in Zenvoices using the pencil icon
Select the button with the gear icon in the top right
Enable the field Commitment (under the category Rule fields)
Click Save in the bottom right
Check the booking lines for the column Commitment to see which line the error message refers to and follow the solution below
Solution:
Navigate in Exact Online Bouw to Purchasing / Commitments
Search for the number (via column Number)
Please note: do not click Project because this will open the project instead
Open it by clicking the number
Click Edit in the top right
Change the status of the delivery ticket by unchecking the field processed (see image)
Click Save at the bottom
Export the booking again from Zenvoices