Patrick Roth has a nice look at issues when checking in a dictionary while Developing for Dynamics GP in his new blog post Failed to check in resources into Dexterity DSCCS.
Failed to check in resources into Dexterity
Payables & ReceivablesDevelopment & Integration
Archived post from 2010. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.