Notifications/Correspondence in eRec Ehp4

Question

Hello All,
Currently when a any activity is create or even when external candidate is registered in the erec system there is default an attachments being attached and sent to the candidates or any recipients. This one i am seeing it from SOST.
My requirement is such that based on the activity which is assigned to the form needs to be triggered for the respective activity when created. But currently when ever i create any activity for the candidate by default an attachments "letter to candidate" in PDF is getting trigged
See the below format of the PDF which is default being triggered as an attachment.
Pls help me
The contains in the PDF is looks like the following which is common for any activity that recruiter creates.
All available information from the form interface is listed
          below, grouped according to the structure.
          Candidate:
          Object ID: 50001200
          Form of Address Key:
          Form of Address Text:
          First Name of Business Partner (Person): mm7
          Last Name of Business Partner (Person): mm7
          Middle Initial or Initials of Person:
          Gender of Business Partner (Person):
          Date of Birth of Business Partner:
          Full Name: mm7 mm7
          Address Number:
          Person Number: 11468
          Interest Group: 0000
          Name of Interest Group:
          Personnel Number: 00000000
          Alias for Internet User: MM7
          R/3 System, Logon Name of User: A5BA7D17111
          Sender:
          Object ID: 00095763
          R/3 System, Logon Name of User: WF-BATCH
          Form of Address Key:
          Form of Address Text:
          First Name of Business Partner (Person): Workflow
          Last Name of Business Partner (Person): Workflow
          Middle Initial or Initials of Person:
          Gender of Business Partner (Person):
          Date of Birth of Business Partner:
          Full Name: Workflow Workflow
          Object ID of Position: 00000000
          Name of Position:
          Object ID of Job: 00000000
          Name of Job:
          Object ID of Organizational Unit: 00000000
          Name of Organizational Unit:
          Recruiter:
          Object ID: 00095763
          R/3 System, Logon Name of User: WF-BATCH
          Form of Address Key:
          Form of Address Text:
          First Name of Business Partner (Person): Workflow
          Last Name of Business Partner (Person): Workflow
          Middle Initial or Initials of Person:
          Gender of Business Partner (Person):
          Date of Birth of Business Partner:
          Full Name: Workflow Workflow
          Object ID of Position: 00000000
          Name of Position:
          Object ID of Job: 00000000
          Name of Job:
          Object ID of Organizational Unit: 00000000
          Name of Organizational Unit:
          Application:
          Object ID: 00000000
          Application Status: 0
          Application Status:
          Application Date:
          Posting:
          Object ID: 00000000
          Posting Status: 0
          Posting Status:
          Header of Job Posting:
          Reference Code of Posting:
          Requisition:
          Object ID of Requisition: 00000000
          Requisition Status: 0
          Requisition Status:
          Requisition Title:
          Cost Center:
          Company of Holding: 00000000
          Name of Company:
          Business Partner Number:
          Name 1 of Organization:
          Country of Branch:
          Name of Country (for display only):
          Region of Branch:
          Name of Region (for display only):
          City of Branch:
          Address Number:
          Object ID of Organizational Unit: 00000000
          Name of Organizational Unit:
          Object ID of Position: 00000000
          Name of Position:
          Object ID of Job: 00000000
          Name of Job:
          Alias for the Requisition:
          Application Close:
          Interest Group: 0000
          Name of Interest Group:
          Candidacy:
          Object ID: 00000000
          Candidacy Status: 0
          Candidacy Status:
          Activity:
          Object-Plan Variant: 01
          Object-Object Type: NA
          Object-Object ID: 50001200
          Activity Type: 1010
          Name of Activity Type: Acknowledge Candidate
          Activity Category: 02
          Name of Activity Category: Simple Correspondence
          Activity Status: 0
          Activity Status: Planned
          Due Date: 15.10.2010
          Global Key for Activities: DFD84FF628ADC5F187A7001B24A2EE00
          Support Team:
          Full Name (Role in E-Recruiting, Name of Role)

Answer 1

Thanks Aqeel for your valuable inputs
I am badly in confused state.
Currently i'll give what i have done can you plsss explain me what should be done for the notification config
Example
IN Table "t77rcf_doc_cat"
1     Documents for Candidates (HTML Editor)     HRRCF_CS_APPLICANT     CL_HRRCF_CS_DOC_CAT_APPL
2     Documents for Invitations (HTML Editor)     HRRCF_CS_APPL_INVITATION     CL_HRRCF_CS_DOC_CAT_INVITATION
3     Documents for Confirmations     HRRCF_CS_EXA_CNF_REQUEST     CL_HRRCF_CS_DOC_CAT_CNF
4     Documents for Candidates (Letter Area)     HRRCF_CS_IT_APPLICANT     CL_HRRCF_CS_DOC_CAT_APPL
5     Documents for Invitations (Letter Area)     HRRCF_CS_IT_APPL_INVITATION     CL_HRRCF_CS_DOC_CAT_INVITATION
Now these document class is assigned to the activity categorie
1     Simple Activities     CL_HRRCF_ACT_SIMPLE
2     Simple Correspondence     CL_HRRCF_ACT_CORRESPOND     4
Then I asign the form to the activity
2020     Job Interview                                                   Internal or External Candidate     000     HRRCF_CS_EXA_INVITATION
Here my question is that when i do the activity 2020 then the form HRRCF_CS_EXA_INVITATION should be triggered right?
But currenctly when i exceute this activity is trigreeing the form HRRCF_CS_IT_APPLICANT which is of document class 4 assigned to the category 2.
What should i do in the cofig if it should send the form "HRRCF_CS_EXA_INVITATION"
Pls help me