How to set a default target system in a change request

Hello,

I would like to set up a default value for the target system when I create a change request,

for example, if I create a CHR in "DEV" system, it would auto fill the "Target" field with "TST"

I tried to look for TPPARAM parameters or some Global ones,

but with no luck

Anyone got a clue how to do it?

Thanks.