Problem
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
Open the class 'MobDocumentConnetor' and choose the method 'submit'.
Change the [SysEntryPointAttribute] to [AifDocumentReadAttribute,SysEntryPointAttribute(true)]