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Thanks for posting to the Community, @robertarranz22.
Currently, our product engineers are investigating the cause to fix the issue. The case code is INV-42272, wherein users are unable to save the Purchasing Information purchased from a vendor.
I recommend contacting our Customer Care Technical support to attach your account to the investigation case. This way, you'll be notified via email once they have fixed the issue.
To stay current with our feature enhancements and product updates, visit our blog site.
Please feel free to leave a message to this post if you need further assistance. I'm always here to help you. Take care!