Using Siebel Tools > Checking Out and Checking In Projects and Objects >

Enabling Object Check Out and Check In

A configuration file parameter controls whether or not object check out and check in is enabled. To enable object check out and check in, add the following parameter to the [Siebel] section of the tools.cfg file, and set it to TRUE:

EnableObjectCOCI = TRUE

NOTE:  EnableObjectCOCI is set to TRUE by default.