"material 49983162: enter a value for attribute period ind.

hi all

I am working on MDG 6.1 and we using NWBC . IN our Development system while creating a Material master we are receiving Error message "material 49983162: enter a value for attribute period ind.(the field is period ind for SLED )  which never used to be mandatory and ECC still is not asking this field to be filled in .

Would you know what might have caused this error ?

Asher