SAP system exists and is not suitable for this installation option

DIAGNOSIS:Valid instance types for this installation option are WD,GW,SCS,ERS,J2EEDI,J2EECI,TREX,HDB, but instance DVEBMGS00 has a different type. SOLUTION: Choose a different SAP system ID or uninstall the existing system.

PROBLEM:
If you get an ERROR DURING "SAP NW PO 7.4 INSTALL AFTER A SUCCESSFUL UNINSTALL OF PI 7.11"

Check
Check /usr/sap  directory and if you see sapservices  file that's the problem maker

Fix
Move the sapservices to sapservices.old
Clean the sapinst logs
Run a new sapinst
Problem will be resolved and sapinst will proceed to next screen


Additional info:
What info does sapservices file have?
LIBPATH=/usr/sap/DEV/SCS01/exe:$LIBPATH; export LIBPATH; /usr/sap/DEV/SCS01/exe/sapstartsrv pf=/usr/sap/DEV/SYS/profile/START_SCS01_devhost1 -D -u DEVadm
LIBPATH=/usr/sap/DEV/DVEBMGS00/exe:$LIBPATH; export LIBPATH; /usr/sap/DEV/DVEBMGS00/exe/sapstartsrv pf=/usr/sap/DEV/SYS/profile/START_DVEBMGS00_devhost1 -D -u DEVadm



tags: po 7.4 install on existing hardware, sap, nw 7.4, install options, process orchestration, uninstall, DVEBMGS00 , install master, sapinst, error,