Question about error outputs

I want to do a check for some immissions with mason, and the elements of RT.
I tried to use abort(loc(‘incomplete data…’)) or $m->comp(‘incomplete data’) $m->abort.
Both work and send me to a page, but when i want to go back, I haven’t my incomplete data anymore…
how can I mantain the data and let the use complete the incomplete data?

Thanks for any response