Adaptive RFC model

hii,

I have an application where am using adaptive RFC model. While deploying and running the application i get an exception :

com.sap.tc.webdynpro.progmodel.context.ContextConfigurationException: DataNodeInfo(DataCust.Zsm_Calc_Csi_Report_Input.Output_csi.It_Output): structure field Severity not found

Any clues why this error is coming at runtime ??