The account assignment objects are defined for different business areas

What causes this issue?

You entered several account assignment objects assigned to different
business areas. In a posting row all account assignment objects must be
assigned to the same business area.

How to fix this error?

Change the account assignment objects if required. The following
business areas have been assigned so far:
Business area Type Object
&V1&
&V2&
&V3&
&v4&
If account assignment objects of different business areas are posted to
at the same time, whereby the business area of the posting row is
derived from the real posting of the CO account assignment object, you
can make the error message a caution or a note, or you can deactivate
it entirely in Customizing. Use the Implementation Guide under
"Controlling: General" and choose <DS:SIMG.SIMG_CFMENUORK3OBA5>Change
message control</>. Enter area KI and message number 196.

Error message extract from SAP system. Copyright SAP SE.