Default Atomia validation configuration is hard coded in product, but this configuration can be overwritten with simple override file. To do so, you need to:

• Add C:\Program Files (x86)\Atomia\Common\atomiaConfigurationStore.overrides file (on all servers that host Atomia GUI applicatins) 
  
• Add rules to it that you want to override.
  

Defaults can be seen in Atomia Configuration Defaults article. Override file must follow same file formatting rules as in this article. For example, if you want changed email validation, you need to add following line to override file:

customer_validation.email.1	 regexp	 {regexp by desire}

Both default and overrides affect all forms that have customer data editing/adding possibility.