Customizing error in work schedule rule 2 S1 01 PAH2

Dear Guru

We have created new work schedule rule and assigned in to IT 7 of each employee form 1st April-2013 & earlier is delimited

While executing the payroll system are giving following error.

Customizing error in work schedule rule 2 S1 01 PAH2

New work schedule is  DPUN = Pune

ES grouping                          2

Holiday Calendar ID             S1

PS grouping                          01

Work schedule rule              DPUN

Earlier work schedule is

Holiday Calendar ID             G1

PS grouping                          01

Work schedule rule              PAH2

We have assigned the work schedule rule in employee master under IT 07 w.e.f. 01-04-2013.

Also we have generated work  schedule  through t.code pt01

Also pl note that for new hiring it is working fine but old employee system are giving above error.

So pl suggest where we have to find out the issue

It is very urgent

Regards

Vijay