Sender Cost Center in CAT2

Hello,

While entering time sheet in CAT2 for a personnel no, sender cest center is automatically coming, its a display field.

We only input Co.Area, Network & Activity No. Rest Sender Cost Center. See the attached file.

Requirement is to change the Sender Cost Center, but I am not able to do it. From where exactly this is pulled up.

I have tried changing the Work Center & activity type maintained in Activity. This new work center is having new cost center. But then also it is not getting changed.

We have changed Time Administrator in PA30 also. Already some hrs are booked against this activity.

Please suggest.

Regards

Shubham Kiyawat