field PROJ-KIMSK - setting a default value for a specific project profile

Hi experts,

i must assign a default value to the field Mask ID (PROJ-KIMSK), which is  '               +++++++++'. I need this value only for a specific project profile eg. YZZZZZZ.

I tried to look at the project profile settings into customizing but i didn't find anything. Then I thought it can be set by means of a substitution .

Went to substitutions>Project system>Project definition created a sub, but alas, from here you can't use field KIMSK .

After these checks, I thougt that maybe the only solution to this problem is implementing an exit into substitution, which by means of ABAP checks project definition and fills up the field KIMSK with the values that I need.

Is there a chance to assign a default value to the field KIMSK without having to implement a user exit? Can you please help me?

Thanks a lot in advance!!!!

Carlo