We often find clients where there are no or few Calls with CM call type category. Corrective Maintenance type calls should be used in every break / fix situation and many reports, including ours, depend on this. Any call that is a break/fix call whether on contract or time and material should be in the CM category for these to work properly.
Installs and scheduled PMs are NOT break fix calls.
DUMMY CALLS FOR LUNCH, TRAINING ETC. SHOULD NEVER BE CM CALLS.
See here for a suggested list of call types.