partner function missing in table TPAR

I am trying to create a new partner function SH. When i create this function and then i try to assign this function to the partner function procedure AG then in the drop down menu for the partner functions this SH does not exist as an option.

I checked the table TPAR and there also this SH does not exist. Any ideas how to maintain this partner function such that it gets updated in the table TPAR?

Thanks