OBAS is installed inside a physical server. ON the attempt to assign an IP Address to a Reseller at:
Top > Account Director > Reseller Manager > Resellers > %reseller% > Hiding > Use one of the IP addresses available within Parallels Business Automation - Standard server > IP address
the following message appears in red line:
Wrong IP format
Such behavior is considered to be a software issue with ID: PBAS-29318 and it is fixed since OBAS version 4.5.2
Upgrade OBAS to the latest version.