问题
We have created a customization to our site that needs approvals. When we go to the mobile application and the Approvals section, we see the item that needs approved but when we go to select the approval item, the following error pops up "Unsupported Protocol: The communication protocol used by the Acumatica ERP server to which you are trying to connect is not supported by the application. Make sure you use the latest version of Acumatica application." Our current site is running 17.206.0030. We can go to the approvals page thru the site and it works fine for the same custom approval. This error only occurs in the mobile application.
Mobile App Error Screen Shot
回答1:
Last time I received the same error message in Acumatica mobile app, there was an issue with the changes, that I made in Mobile Site Map. Let me suggest to delete all Mobile Site Map customization files from the local website, restart the mobile app and try to open the Approvals screen on a mobile device.
If there will be no issues with the Approvals screen after you remove all Mobile Site Map customization files, you might consider applying different parts of your Mobile Site Map customization to determine what particular changes are causing this error. And in case of a Mobile Site Map customization built using MSDL, there is also a built-in option to enable MSDL interpreter logs, which are usually quite helpful to verify no errors have been produced by the MSDL interpreter.
来源：https://stackoverflow.com/questions/49116983/acumatica-mobile-application-approval-error-unsupported-protocol