Existing user '[SID]adm' on the local host does not have 'sapsys'

[PetriS]

Getting below error when running

# ./hdblcm

Enter SAP HANA System ID: [SID]
Existing user '[SID]adm' on the local host does not have 'sapsys' configured as primary group.

on suse:sles:15:sp3 using SAP HANA Database (2.00.073.00.1695288802) in /software/HDB_SERVER_LINUX_X86_64.73/ - installer

[mamartins]

Is this a new installation? Or are you trying to update an existing one?

The message is pretty clear, the '[SIDadm' user for the HANA instance must belong to the 'sapsys' users group.