Calculation of Grant's Expenditure/Revenues.

Hello Experts,

Can anyone suggest how do we calculate Grant Expense and Revenue. I found Table "GMGR" holds this information(GM Valuetype 99 Expenses/Revenues [Grant]). But how to extract Expense and Revenue from the Valuetype 99?

Please suggest.Also bare my simple questions as i am new to Public sector management.

Thanks

Prabaharan