Trap typecast

From Axaptapedia

[edit] Typecast from int64(RecId) to boolean

(tested in DynamicsAX 2009)

the implicit typecast from int/int64 to boolean is often used in ax sources...

public boolean exist( EDT _value)
{
    return (select * from table where table.field == _value).recId;
}

BUT.....

when the RecId (as 64bit integer) last 8 bits are 0 the typecast results in a false even though the RecId is not 0

so, take a look at the bestpractice (design patterns for table exist method)

when you'll need a boolean, than use a boolean expression !!!

return (table.RecId != 0)