If you want to add custom fixed values to a standard domain fixed value list you can do this with fixed values append method in transaction se11.
- Go to transaction se11 and select the domain.
- Select Goto>Fixed Values Append from the main menu.
- Provide an append structure name.
- Set the new fixed values you want to add to the domain.
- Save and Activate the domain.
You can add more than one appends to a domain.
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