Activity & is not in the number range table

What causes this issue?

Activity &V1& is not defined in the number range table (TKA04). The
activities have the following business meanings:
RKP1 - Direct cost planning
RKP5 - Revenue planning
RKP2 - Activity type planning
RKP3 - Activity input planning
RKP6 - Activity-dependent direct cost planning
RKP7 - Activity-dependent activity input planning
RKP4 - Statistical key figure planning
RKPW - Secondary order cost planning
RKPX - Activity-dependent secondary order cost planning

How to fix this error?

Start report RKTKA04C. This report adds all missing activities to
table TKA04 for all clients.
<DS:TRAN.SA38>Proceed</>

Error message extract from SAP system. Copyright SAP SE.