Problem with FM "DYNP_VALUES_UPDATE"

Hi gurus

I am using a table control containg 2 columns. I have used a f4 help in the first column by the fm "F4IF_INT_TABLE_VALUE_REQUEST" . And the corresponding second column i am displaying a value for which i have used the fm "DYNP_VALUES_UPDATE" . It's working fine but after the values upadted in the second column , the value in the first column vanishes.It becomes balnk .

so please help me . thanks in advance .

regards

Amarendra