Follow the below path to view the challan details on greytHR?
To work with an existing challan, click any challan in the Overview tab.
Click show details (1) to view list of unmapped employees in a spreadsheet so as to allocate them. Any excess (3) or partial (2) payment made earlier show in grids. Click here (4) to update, if required, your PAN and other entries in System Settings.
If you have made excess payment, click 
in the Adjust Amount column of excess payment to adjust with current partial payment.
A message displays to indicate successful adjustment.
The excess payment grid disappears.
Note that partial payment can be done only within a Quarter but excess payment can be carried over across Quarters till adjustment is completed. Employee allocation is automatic for adjustments
Click the Challan tab to view the excess amount adjustment with same challan number as the parent challan.
Partial amounts are child challans and excess amounts are parent challans. The actual excess maps to the Challan Amount column in the excess payment grid. It is equal to the sum of the IT Mapped (how much to adjust) and Excess Amount (post adjustment amount) columns. Note that only child challans can be deleted. You can also export the details to MS Excel.