I can't insert the value of SNMP community

I can't insert the value of SNMP community

Good day
I can't insert the value of SNMP community.
On our network employs about 300 network devices. SNMP community = alanet + *.
 Inserting the value "alanet + *" in the "Admin"> "Credential Settings"> "Credential Library".  After updating the value Credential SNMP community is changing with "alanet + *"  to "alanet *", without the symbol "+".

Can you help us ?
Kind regards
Andrew
Centos 5.5, OpManger8(30-day trial)

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