search help with negative values

Hello All,

I have attached one zsearchhelp to one z field(domain-menge) now this field contanis some negative values.

the moment i press f4 on this field in runtime it gives me error

" A packed number contains no sign."

f4 help is not showing negative values which is resulting in the above error

pls suggest the solution for the same.... how can we show negative values in f4 help.

Sunny