Including message error if I filling in a flexfield with a kind of data different from the assigned

Summary

Including message error if I filling in a flexfield with a kind of data different from the assigned one

Content

Hi,

I have a question about flexfields configuration. I created a flexfield inside Details section of a Job Requisition. This flexfield has Number as Data type, however when I filling in this field I have the possibility to include also chars, without any error message appearing. Then if I reopen the Job Requisition, If I have not previously included a number data the flexfield remains blank. Can I ask you If there is a way to signal to the user that he cannot enter a data other than a number during the compilation of the flexfield?