About best practice to validate SocialSecurityNumber

Hello!

I have one agent to read the datasource and one agent to create homedir.

I use Extensible Connectivity Agents and wonder about one thing. Assume SocialSecurityNumber has invalid format in the database. Where would I validate this.

HomeDir  CS   MV   CS   CD(datasource)

Is there any best practice about this. This validation can be done in many different places.

//Tony