Gereic data to cube giving error

When i am loading data from generic datsrc to cube giving me the error

Exception wrong_date ; see long text RSTRAN 303

Diagnosis

An exception wrong_date was raised while executing function module

RST_TOBJ_TO_DERIVED_TOBJ .

System Response

Processing the corresponding record has been terminated.

Procedure

To analyze the cause, set a break point in the program of the

transformation at the call point of function module

RST_TOBJ_TO_DERIVED_TOBJ . Simulate the data transfer process to

investigate the cause.

I am working on 7.0 when i go to debug mode from DTP I can see the code but I am not getting what to do there

pls guide me