Non-linear material data entry in Radioss

I have a set of stress vs strain for a non-linear elastic-plastic material. How may I create a material in radioss for the same?

I have used M36_PLAS_TAB and input the data in fct_ID_E, but the solver is showing following error: 

ERROR ID : 975
** ERROR IN MATERIAL FUNCTION DEFINITION
DESCRIPTION :
YOUNG�S MODULUS SCALE FUNCTION SHOULD DECREASE WITH PLASTIC STRAIN

Please try to help ASAP.

Regards,

Rachit