Figure 1. SZERO Format
If you specify SZERO, MFX will treat numeric zero values as signed, therefore -0 and +0 are treated as different values. This affects both collating (SORT/MERGE) and other operations like INCLUDE/OMIT.
If you specify NOSZERO, MFX will treat numeric zero values as unsigned, therefore -0 and +0 will both be treated as +0.
The installation default is NOSZERO.