Hello Steve
This procedure is valid for every field:
1 - Click the desired field and press F1.
2 - Click the option "technical information"
3 - Check the value of 'Search Help'. For the order number on CO03 the search help is 'CO_SH_PRODORD_ALL'.
4 - Open the search help in transaction SE11.
5 - Here, you have two options:
- Use the search help exit to change the logic of existing change helps.
- Make a modification to add a new entry on the tab "included search helps", in order to include a new tab on the search help.
I suggest you to discuss more details with your ABAP consultant, to add this new entry or to implement the exit.
BR
Caetano