>I have a report that uses Eval(Field(x,"query")). It has the capability to present 42 fields. However, not all the querys will produce this many fields and I get a "Missing Expression" on the missing fields. Any idea on how to fix this. Can I pad fields to the end of a query?

Change expression to :
iif(fcount('query')>=x, evaluate(field(x,"query")),"")