SAP HR Time Management

Hi Team,

I am doing a Time Management Project. I have a problem in creating PWS for A,B & C shifts, i have created A,B & C shift as usual with A Shift for week 001, B shift for week 002 & C Shift for week 003 for same grouping 01  when i enter to save it is showing  " Please sort sequential numbers in ascending order" .

Kindly guide me to configure the period work schedule for  shifts.

Regards

Subs