Time getting changed automatically in planned working hours in SPRO in DWS

Hi all,

I am pretty new to SAP-HCM and to SCN as well. Bear with me if i post something which is very basic. I have a requirement from a customer in Sweden and I must create a new work schedule. The requirement is 7,83 hours for Monday,wednesday and friday(from 08:00 to 16:23) and 4,89 hours on tuesday and thursday (from 08:00 to 13:24) including 30 mins of breaktime. Now when i go to SPRO and configure DWS for this, the time gets automatically changed from 16:23 to 16:20 (the planned hours remain the same 7,83). And in the other case, when i enter, the time changes to 4,88 and end time changes to 13:23. Due to this, when i check in CAT2, the total hours shows up as 33,25 (requirement is 33,27). However, in IT7 (planned working time), it is showing up correctly as 33,27 and daily working hrs as 6,66. In SPRO, i have used the already existing break schedule (which has a duration of 30 mins) and I also use a DWS selection rule which is already existing in the system for Sweden. My concern is what is the issue that is changing this time automatically no matter how many times i try to correct it?? Can you pls guide me??

Regards,

Vikas Gautham R