The recovery indicator is being re-derived

<ZK>&CAUSE&</>
The account assignment was changed.
The system re-derives the recovery indicator, even though this was
previously set manually.
If the recovery indicator was set manually before account assignment,
you can now check the derivation results, if necessary, overwrite it
manually.
<ZU>Exception:</>
If you are in multiple account assignment for a purchase order, or
purchase requisition, the system automatically overwrites all manual
changes to the recovery indicator by re-deriving it.
<ZK>Manual entry of the recovery indicator is not included in multiple
account assignment</>.
Note
You can control the way this message is issued, according to user.
For more information, see the Implementation Guide (IMG) under General
Controlling,
<DS:SIMG.SIMG_CFMENUORK3OBA5>Change Message Control</>
(If required, create or maintain message no. 398 for work area "KI")
If you do not enter a user, the change applies to all users.

Error message extract from SAP system. Copyright SAP SE.