How to get the values of all rows in advanced table

HI All,
I am using an advanced table to enter the values for the service contract line (its a custom page)in that advanced table i ahave column with lov called task number for that task number once i had choosed one task number and creating one more row using add anethor row button i want to restrict the user to not to choose the task number which was entered in the previus row.
Or if this is not possible i want to restrict the user by showing an error message when click on the submit button by saying you have choosed the duplicate task number please choose a uniqu task number
please give some hints
thanks
ajay

Hi
your approach will have two steps
1.) use the row refernce and get the value of task number of the row which is enterd by user .
2.) use getRows in range and compare values of task number of every row with the user selected value ,if value match then throw error.
Thanks
Pratap

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