Does Advanced PDF have limit with joint on custom fields? I added a custom field on transaction records. Custom field is a list of employees. On PDF, I want to grab the employee's phone number. SO I put:

${record.custom_field.phone}

This continually gives me the following error:

Notice
 
The template cannot be printed due to the following errors:

Exception during template <http://merging.com|merging.com>.netledger.templates.TemplateServiceException: Exception during template merging.java.lang.NullPointerExceptionPlease contact your administrator.

In UI, I can click the employees name to go to employee record. Once I remove

.phone

the PDF loads just fine and shows correct employee value.