The automation UI allows to add mappings with unsupported period types

The current automation UI allows adding mappings with unsupported period types. Force the user not to add those mappings with a friendly warning message. 

Steps to reproduce:

1. Navigate to the Automation view of the module. 
2. Schedule a mapping with an unsupported period type. (ex: bi-monthly) 

Alternatives:
You can disable the items and say the mappings with unsupported period types are disabled or something.