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The service 'MobDocumentService' could not be generated. Error:SysEntryPointAttribute must be specified on a method exposed as a service operation. Class: MobDocumentConnector, Method: submit.
Example on below image.
Has been observed in AX2012 R3 CU11. However it does work in RTM and CU13.
Solution
1) In your port settings make sure that the service is granted access.
2) If you are abolutely sure that you can not grant access to the service, you can make the change mentioned below.
BUT, be sure to understand that with the change lots of security rights must be set up, as you now only have read rights.
Open the class 'MobDocumentConnetor' and choose the method 'submit'.
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