Virtual Chassis configuration on Juniper EX4600

So yesterday I’ve been configuring a two-member Virtual Chassis on Juniper EX4600. I’ve been following the guide but configuration wouldn’t save when issuing commit or commit synchronize command with the following error

Member’s information missing from provisioning database

Turns out, when adding members to VS

user@switch# set member 0 serial-number abc123 role routing-engine
user@switch# set member 1 serial-number def456 role routing-engine

serial numbers must be entered with UPPER CASE letters. I wish this was mentioned in the guide or at least the guide didn’t use lower case letters in the examples. Could’ve saved me a lot of time 🙁