Organization management in Bonita BPM Studio

Hi,

I'm using ACME organization user in my development. In the custom tab next to Business Card tab i created new attribute called 'User ID'. My question is how can i retrieve value from the attribute in the custom tab.

![Picture][Picture] https://docs.google.com/file/d/0B5xMaf-KOjPvM0ZwVGFIMDJZWVE/edit

i used code below to retrieve email from user like helen kelly and i get 'helen.kelly@acme.com' so i reused code below to get user id from custom tab but i got error //GET EMAIL BonitaUsers.getUserProfessionalContactInfo(apiAccessor,BonitaUsers.getProcessInstanceInitiator(apiAccessor,processInstanceId).getId()).getEmail()