Save random number without replacing it if the survey is reopened

Hi everyone

I have a question, if at the beginning of the survey a random number for each participant is drawn, and then a participant closes the survey and reopens it at a later point in time, how do I make sure that not a new number is drawn, but the value set in the first place is taken as the relevant value? So i basically want to make sure that for each participant the number is only drawn once, and every time he/she reopens the survey the same value is taken.

Thank you very much for your answer

Deborah

Hello,

See ask1 question in :
manual.limesurvey.org/Expression_Manager...e_Question_Per_Group