3rd Substring from a Field in OTBI

Summary: Need 3rd Substring from "Job"."Job Name" 

Content (please ensure you mask any confidential information):

I have "Job"."Job Name"  field and the data looks like

"Unmapped.Unmapped.BUSINESS ANALYST (BI)"

I want 3rd substring. Using the below formula but giving blank result. Kindly help.

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):

SUBSTRING("Job"."Job Name" 

FROM LOCATE('.',"Job"."Job Name",

LOCATE('.',"Job"."Job Name",

LOCATE('.',"Job"."Job Name")+1)+1)+1 

FOR (LOCATE('.',"Job"."Job Name",

LOCATE('.',"Job"."Job Name",