Help for runtime change in list item

Question

hi
i have created a tabuler form and have list_items on it
i want when i
select category monitor then in next list i get monitor's serial numbers
in next record when i select printer then in next list i get printer's serial numbers
i had tried it on first list WHEN_LIST_CHAGE it work for the first time but when i select another category then it generate an error can not create record group a (a is the name of the record group which i had created for the first time )
similarlay with other categories
plz help me

Answer 1

In your code, you should check if the record group already exists. If it does, delete it first before creating it again.
RG := FIND_GROUP('a');
IF NOT ID_NULL(RG) THEN
  DELETE_GROUP(RG);
END IF;
RG := CREATE_GROUP('a'); -- or use CREATE_GROUP_FROM_QUERY
(RG is a variable declared to be of type RECORDGROUP, and "a" is the name of your record group.)