Question about checks for min and max values

[Henry Melancon]

Windows Server 2000 Service Pack 4 & Filepro 4.8.10

Our QC Department checks the min and max values of chemical data.  Can anyone tell me why 
when I select zero as a minimum value, Filepro does the comparison and allow a blank field to be acceptable?

For example, the specification for a given material requires that a value be reported for the chemistry.  When my data input clerk enters no value, I want Filepro to flag this and print an exception report.

Example:   IF    58 LT 59
         THEN   PRINT REPORT

If 58 is a blank field and 59 is "0", I get no report.

This is probably very simple to experienced Filepro user, but I am not an expert at programming in Filepro.  It has been over 20 years since I have had a programming class and I am very rusty.  Any help would be appreciated.

Henry W. Melancon
Documentation Supervisor
Quality Control Department
Gulf Island, L.L.C.
Houma, Louisiana   70359