User Exit For MRP RUN

Hi all ,

I am using the user exit for the Plant A - MRP by MRp Type.

and i would like to use the same enhancement in the Different project in Plant B MRP by Material Group , But the sys is not allowing to use the same enhancement saying the enhancement is already used in the Project .

Whether i have to code in the Same project or i can create TWo project with the same enhancement ?

Regards