If you are using the TFS MMSSCI Provider with powerbuilder you probably noticed your checkins are being added in changeset increments of 25 files. To explain, if you have 100 files in your check-in you will see 4 changesets for that "one" checkin. To change this behavior alter the SccMaxArraySize setting of the of the PB.INI file. This setting can be found in the [Library] section of the PB.INI file.
So something like the following:
Thanks to Ed Hintz and Pei Gu for running this down