TimeTrex Time and Attendance

Dear all,

I am new to timetrex. I have installed it and very much impressed.
I have a query on this I want to validate Punch in/out Like:

* When a user punches in he/she should not be able to punch in again without punching out and vice-versa.
* Disable the option to select Punch In/Out.

can anybody pls suggest how to do this.

cheers,
raj

That would require extensive source code modification in order to achieve.