Issue:
Ex. if you want to call a transaction with parameter using ITS service in webdypro, the parameter is not passed to the webgui screen eventhough you passed the correct field name
Logon to R/3 with the user credential check is there is any SAP inbox alert is there.
Apply this note http://service.sap.com/sap/support/notes/1465767
and set parameter in SICF your service GUI Parameter ~NO_LOGON_USEREXIT to 1