Profitability segments can only be entered under single entry

What causes this issue?

You chose screen variant &V1& for the list entry.

System Response

You can use screen variant &V1& to assign profitability segments.
However, you should note that you can only enter profitability segments
as single entries for technical reasons.
You can only display profitability segments in the list entry.

How to fix this error?

Choose single entry to enter profitability segments.

Error message extract from SAP system. Copyright SAP SE.