How to adjust the MTO tag no

Hello All,

I'm using OPM 08.11.11.304 and OPIM 08.11.11.284. I have set the MTO order in report.def, list FLD  then SUP.

   WRITE = fld  
   WRITE = sup

In the ISO, fld material are above sup material indeed, but the tag no of fld is larger than sup, it looks weird. I'd like to know how to adjust the tag no. Thanks a lot!