we have hub architecture in our Fiori landscape and our Gateway system is connecting to ECC dev and ECC Quality both the systems. So we have created ECC_DEV_PGW and ECC_QAS_PGW system alias with /IWPGW/BWFas a s/w version with selecting the corresponding RFC destination. To switch the MyInbox tasks under scenario definition, I am not able to get the System Aliases F4 Help with ECC_QAS_PGW to point my MyInbox to Quality ECC where as I am getting DEV system alias entry in the Value Help. I did the same 10 days before at that time I was able to see all the aliases in the F4 Help.
Please let me know if anybody is facing a similar issue.