Can I use a specific criteria to select members from a list?

@Relative(Group

Hi,

I have created a Business Rule with the following syntaxis:

FIX(......., Amount, @Relative(Group of accounts,0)....)

"Local"(

IF("Amount"<0)

"1111"=@SUM(@Relative(Group of accounts,0),"1111");

)

ENDFIX;

However, it does not calculate. I would like to filter the members to only sum the ones that fills the criteria of the amount being below 0.

Thanks in advance.