BDC of DP90 not running when calling from WebDynpro

Hi,

I have created one function module for BDC of DP90.

It is running fine while executing from SAPGUI itself.

but it's giving following error when calling it from WebDynpro.

Internal error occurred when method CREATE OBJECT was being accessed from class CL_GUI_CUSTOM_CONTAINER

How to resolve this error?

It is giving error at the time of creating PF-Status of ALV. Pl. suggest if there is any SAP Note available for the same.

Thanks,

-Haresh