For example a Client cannot be created on the app without an email, and an invoice/quote cannot be created without an Item. This is not an issue on the web, which is good, because I run a handyman/painting business and often dont use E-mail communication, and rarely have a need for the Item field since I just populate the description field with the rendered services.
I didnt notice any app reports on github, so thats why its here in the support forum.