Master Detail : Default value to '0' in Detail

Hi All,
I am new to Apex. I need some assistance with a Master-Detail form I created in Oracle APEX. The detail table has few columns and during ADD ROW (@ detail level), I have been trying to default the values in the detail table to '0'. But, I have had no luck with my multiple attempts. Can the experts please tell me how to get the default values working? I really appreciate your assistance
Thanks!!

Hi Ben,
I have Master/Detail page which I have created. In Detail section I have close to 15 columns. In that 10 are number columns. In those number columns when I do a add row I would like to have a default value of '0'. Lets say I have Price column and in that column I would like to have a default value of '0'. I have tired a lot but could not figure it out. Please let me know if its not clear. I can put some examples.
Thanks!

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