VERIFIED SOLUTION i
Product Feature: Cyclic Maintenance
When routine works are committed they should at that moment allocate gangs as per the setup rules. When the customer was printing their period tickets the details were not displayed as the gangs had not been auto assigned. After performing the allocation manually the tickets appeared.
The code was debugged and if you do not have the default gang set up on the contractors lookup (this is the default gang) then the rules would not be picked up.
ResolutionUPDATED: March 24, 2017
If the customer sets up a default gang on the Contractor's lookup then they will not encounter the error.