@Siwei Dai , Based on my research, it seems an issue with Dynamic 365.
https://learn.microsoft.com/en-us/dynamics-nav-app/across-how-setup-income-documents
As we are not familiar with this. we suggest to contact Dynamic 365 support in the following link to get help.
https://dynamics.microsoft.com/en-us/contact-us/
Thanks for the understanding and have a nice day!
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