Hello,
You should consult with your functional person.
Field "ZAEHL" is an internal counter for the number of alternate task lists getting created.
Group counter is a field which can be user defined though system generates in increment.
Whenevr every alternate task list created ZAEHL get increments number.
PLKO-ZAEHL is the number of routings per group
MAPL-ZAEHL is the counter for the number routing assignments to a material
PLAS-ZAEHL is the counter for the number routing operation.
I am not sure in OP84 activate 'Entry tool' indicator for application 'P' and your profile and use that profile in your BAPi.
Best Regards,
R.Brahmankar