Problem with Current row of a VO???

I have a Advanced table region in which i add many rows..and i get the data in to it from the lov page (lov mappings).
for each row i add... i have to set a item in main page table region doing some validations the data i get from lov region.
with examples..more detailed..
i have paymentAmount and AllocAmount...i get the payment Amount from LOV...after doing some validation on paymnetAmount i have to set the same value to the AllocAmount.
ARTransactionLine is the VO which contains the above mentioned attributes....and advanced table i mentioned above is based on this VO.
for this purpose im using the following code..
ARTransactionLineVOImpl
vo=(ARTransactionLineVOImpl)findViewObject("ARTransactionLineVO1");
ARTransactionLineVORowImpl TransDetailsVORow = (ARTransactionLineVORowImpl)vo.getCurrentRow();
payment_amount = TransDetailsVORow.getPaymentAmount();/*for this paymentAmount i made a lov mapping..so that currentrow contains the value of paymnetAmount from lov page*/
if(/* some validation*/){
TransDetailsVORow.setAllocAmount(payment_amount);
now when i do this ..for the first row it is working fine...but for the second row it is failing...getCurrentRow() is giving the values of previous row..not the current row...
first of all what does this getCurrentRow return???
help me ...n tell me where i was wrong...

I m sure you have not gone through the tutorials completely.
ARTransactionLineVOImpl vo =(ARTransactionLineVOImpl)findViewObject("ARTransactionLineVO1");
ARTransactionLineVORowImpl TransDetailsVORow = (ARTransactionLineVORowImpl)vo.getCurrentRow();
with this row i am doing the below opeations..
Number x=TransDetailsVORow.getPaymentAmount();
/* some validations*/
TransDetailsVORow.setAllocAmount(x);
Change to
ARTransactionLineVOImpl vo =(ARTransactionLineVOImpl)findViewObject("ARTransactionLineVO1");
ARTransactionLineVORowImpl TransDetailsVORow = (ARTransactionLineVORowImpl)vo.first();
while (TransDetailsVORow!=null)
Number x=TransDetailsVORow.getPaymentAmount();
/* some validations*/
TransDetailsVORow.setAllocAmount(x);
TransDetailsVORow = (ARTransactionLineVORowImpl)vo.next();
Tapash

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