Modifying/Deactivating PM Schedules
Sometimes a PM's Schedule needs to be adjusted or deactivated. This can be done but only in certain circumstances. To modify/deactivate a PM Schedule :
The PM or PM Group cannot be linked to an open Work Order , or If PM or PM Group is linked to an open Work Order , the PM's Status must be set to 1|Awaiting WO Generation .
Open the PM/Templates module. Open PM/Template whose schedule you wish to modify. *The PM must show Status of 1|Awaiting WO Generation in order to make schedule changes. Edit the schedule fields as needed. Click Save
Enter a reason (optional) and click OK . A record will be added to the PM Tracking grid documenting the schedule change. Close the record. The Work Order will be generated on the new schedule.
Open the PM/Templates module. Open PM/Template whose schedule you wish to deactivate. *The PM must show Status of 1|Awaiting WO Generation in order to make schedule changes. Clear out all of the scheduling fields. Click Save
Enter a reason (optional) and click OK . In the Core Information section of the PM form, mark the record as Inactive . Click Save If the Prompt for Reason when PM is Unscheduled Work Option is enabled a pop-up will appear prompting you to enter a reason for unscheduling the PM . Enter a reason (optional) and click OK . A record will be added to the PM Tracking grid documenting the schedule change.
How to Modify a schedule for a Standard PM
the PM/Template whose schedule you wish to modify. *The PM must show Status of 1|Awaiting WO Generation in order to make schedule changes. 
. A pop-up similar to the following will appear to identify the schedule change and ask for a reason for the change:
to expand the desired Grouped PM record.
. (The Invactive checkbox cannot be edited on a Grouped PM.) The PM Group's Work Orders will no longer generate.