For object RF_BELEG 1111, number range interval 50 does not exist FBN1

Hi Experts,

I am getting this error while doing MIGO. Please suggest for this error "For object RF_BELEG 1111, number range interval 50 does not exist FBN1"

Next i have checked through FBN1 but i am surprised to see even line no 50 is already maintained for my company code.

Please suggest what else to be checked.

Thanks in advance.